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Mathematical solution
In mathematics, a weak solution (also called a generalized solution) to an ordinary or partial differential equation is a function for which the derivatives
Weak_solution
Game whose outcome can be correctly predicted
simple enough to remember (e.g., Maharajah and the Sepoys). An ultra-weak solution (e.g., Chomp or Hex on a sufficiently large board) generally does not
Solved_game
Type of differential equation
example for a weak solution is as follows: ϕ ( x ) = 1 4 π 1 | x | {\displaystyle \phi (x)={\frac {1}{4\pi }}{\frac {1}{|x|}}} is a weak solution satisfying
Partial_differential_equation
Mathematical tools
}fv\,dx.} This is what is usually called the weak formulation of Poisson's equation. Functions in the solution space V {\displaystyle V} must be zero on
Weak_formulation
Chemical compound
at 14%, 20 °C. Stoichiometric solutions are fairly alkaline, with pH 11 or higher since the hypochlorite ion is a weak base: OCl− + H2O ⇌ HOCl + OH− The
Sodium_hypochlorite
continuous, then there exists a unique solution u ∈ H 0 1 ( Ω ) {\displaystyle u\in H_{0}^{1}(\Omega )} to the weak problem (*). If further A ( u , φ ) {\displaystyle
Elliptic boundary value problem
Elliptic_boundary_value_problem
On weak solutions of differential equations
classical solution satisfying the PDE in regular sense, so we search for a weak solution at first, and then find out whether the weak solution is smooth
Regularity_theory
coerciveness, solution can be shown to exist in a weak sense, so-called "weak solutions". A general regularity theorem than implies that the solutions of the
Sobolev spaces for planar domains
Sobolev_spaces_for_planar_domains
Measure of the tendency of an acid to dissociate
present, in solution, in equilibrium with each other. HA ⇌ H+ + A− Acetic acid (CH3COOH) is an example of a weak acid. The strength of a weak acid is quantified
Acid_strength
Second-order partial differential equation
(see weak solution). It is common to take a different sign convention for this equation than one typically does when defining fundamental solutions. This
Laplace's_equation
Solution to partial differential equation
(defined below), one can define a type of weak solution called viscosity solution. Under the viscosity solution concept, u does not need to be everywhere
Viscosity_solution
Mathematical theorem
bilinear form can be "inverted" to show the existence and uniqueness of a weak solution to a given boundary value problem. The result was proved by J. Nečas
Babuška–Lax–Milgram_theorem
Theorem in probability theory
class of stochastic differential equations a weak solution with pathwise uniqueness implies a strong solution and uniqueness in distribution. In its original
Yamada–Watanabe_theorem
2022 South Korean television series
Weak Hero (Korean: 약한영웅) is a South Korean television series written and directed by Yoo Soo-min with Kim Jin-seok and Park Dan-hee, starring Park Ji-hoon
Weak_Hero
Boundary condition for generalized functions
with prescribed boundary conditions (boundary value problems), where weak solutions may not be regular enough to satisfy the boundary conditions in the
Trace_operator
Aqueous solution of a weak acid and its conjugate base
acts as a buffer in the ocean. Buffer solutions resist pH change because of a chemical equilibrium between the weak acid HA and its conjugate base A−: HA
Buffer_solution
Photographic process
paper with a weak solution of ordinary table salt (sodium chloride), blotting and drying it, then brushing one side with a strong solution of silver nitrate
Salt_print
Differential equations involving stochastic processes
what constitutes a solution to the SDE. There are two main definitions of a solution to an SDE, a strong solution and a weak solution Both require the existence
Stochastic differential equation
Stochastic_differential_equation
Concept in optimization
always less than or equal to the solution to the dual minimization problem. So, in short: weak duality states that any solution feasible for the dual problem
Weak_duality
Antiseptic solution rubbed on skin before surgical operations
Tincture of iodine, iodine tincture, or weak iodine solution is an antiseptic tincture containing iodine, ethanol and water. It is usually 2% elemental
Tincture_of_iodine
Concept in mathematics
unconditional existence and uniqueness for weak solutions of the harmonic map heat flow. Moreover, he found that his weak solutions are smooth away from finitely many
Harmonic_map
Elliptic partial differential operator
as weak solutions. For example, we say that a function u belonging to the Sobolev space W 1 , p ( Ω ) {\displaystyle W^{1,p}(\Omega )} is a weak solution
P-Laplacian
Mathematical equation
that every weak solution of Laplace's equation is a smooth solution. This contrasts with the wave equation, for example, which has weak solutions that are
Weyl's lemma (Laplace equation)
Weyl's_lemma_(Laplace_equation)
Functional analysis theorem
function can be "inverted" to show the existence and uniqueness of a weak solution to a given boundary value problem. The result is named after the mathematicians
Lions–Lax–Milgram_theorem
Generalisation of the derivative of a function
products of functions also hold for the weak derivative. This concept gives rise to the definition of weak solutions in Sobolev spaces, which are useful for
Weak_derivative
Solution in which the solvent is water
characteristic of an aqueous strong electrolyte solution; the solutes in a weaker electrolyte solution are present as ions, but only to a small degree
Aqueous_solution
equation) is a stochastic differential equation which has a weak solution but no strong solution. It is therefore a counter-example and named after its discoverer
Tsirelson's stochastic differential equation
Tsirelson's_stochastic_differential_equation
example of a stochastic differential equation which admits a weak solution but has no strong solution. It is named after the Japanese mathematician Hiroshi Tanaka
Tanaka_equation
3-dimensional Navier–Stokes equations is not known to hold for weak solutions, since a weak solution u {\displaystyle u} is only known to satisfy u ∈ L 2 ( [
Lions–Magenes_lemma
Theorem limiting types of conformal mappings in Euclidean space of dimension > 2
derivative, T is the matrix transpose, and I is the identity matrix. A weak solution of this system is defined to be an element f of the Sobolev space W1
Liouville's theorem (conformal mappings)
Liouville's_theorem_(conformal_mappings)
Measure of the level of acidity or basicity of an aqueous solution
equilibrium of solutions of sodium hydroxide at higher concentrations must also be considered. A weak acid or the conjugate acid of a weak base can be treated
PH
Chemical compound giving a proton or accepting an electron pair
the solution to cause the acid to remain in its protonated form. Solutions of weak acids and salts of their conjugate bases form buffer solutions. To
Acid
Oxidizing acid mixture containing sulfuric acid and hydrogen peroxide
container containing even a weak or depleted piranha solution should be labelled appropriately to prevent this. The solution should be allowed to cool,
Piranha_solution
Type of differential operator
lemma and Fredholm alternative, states the sufficient condition for a weak solution u to exist in the Sobolev space Hk. For example, for a second-order
Elliptic_operator
Substance whose dissolved ions conduct electricity
weak. The properties of electrolytes may be exploited using electrolysis to extract constituent elements and compounds contained within the solution.
Electrolyte
Base that does not dissociate completely in water
A weak base is a base that, upon dissolution in water, does not dissociate completely, so that the resulting aqueous solution contains only a small proportion
Weak_base
Type of fuel cell
diffuses through the membrane without reacting, methanol is fed as a weak solution: this decreases efficiency significantly, since crossed-over methanol
Direct_methanol_fuel_cell
Species of flowering plant
frequently, as they could rot. The plant should be fed monthly with a weak solution (water-soluble fertilizers, diluted to half strength, are best) during
Nertera_granadensis
Type of partial differential equation
existence of a weak solution of a differential equation with reasonable ease using some functional analysis arguments. However, the weak solution exhibited
Free_boundary_problem
Solute that (almost) completely ionizes or dissociates in solution
completely, ionizes or dissociates in a solution. These ions are good conductors of electric current in the solution. Originally, a "strong electrolyte" was
Strong_electrolyte
Shock wave that is inclined with respect to the incident upstream flow direction
1, in oblique shock M2 can be supersonic (weak shock wave) or subsonic (strong shock wave). Weak solutions are often observed in flow geometries open
Oblique_shock
Model in finance
explicit solution of the Heston price equation in terms of the volatility was developed by Kouritzin. This can be combined with known weak solutions for the
Heston_model
Principle in mathematical optimization
The optimal solution to the dual program is a lower bound for the optimal solution of the original (primal) program; this is the weak duality principle
Duality_(optimization)
Vector space of functions in mathematics
that weak solutions of some important partial differential equations exist in appropriate Sobolev spaces, even when there are no strong solutions in spaces
Sobolev_space
Chemicals used to whiten or disinfect
solution, 3–6%, (common household bleach) is typically diluted for safe use when disinfecting surfaces and when used to treat drinking water. A weak solution
Bleach
Unequal size of the eyes' pupils
stimulus, segmental iris constriction, and sensitivity of pupil to a weak solution of pilocarpine. Oculomotor nerve palsy: Ischemia, intracranial aneurysm
Anisocoria
Geometric flow
a proper and locally Lipschitz function u on M which is a positive weak solution on the complement of U and which is nonpositive on U; moreover such
Inverse_mean_curvature_flow
Board game
in a draw. After eighteen years, they have computationally proven a weak solution to the game of checkers. Using between two hundred desktop computers
English_draughts
Type of photographic print
chlorate as the restrainer (which is ineffective for palladium), a weak solution of sodium chloroplatinate is used instead. Sodium chloroplatinate, in
Platinum_print
Method of chemical quantitative analysis
to form a neutral (pH = 7) solution. A strong acid will react with a weak base to form an acidic (pH < 7) solution. A weak acid will react with a strong
Acid–base_titration
Colorless flammable liquid with an ammonia-like odor
nuclear reactor waste. Some colour photographic processes also use a weak solution of hydrazine as a stabilising wash, as it scavenges dye coupler and
Hydrazine
Inequality for Harmonic Functions
to solutions of elliptic or parabolic partial differential equations. Such results can be used to show the interior regularity of weak solutions. Perelman's
Harnack's_inequality
solution (sometimes also called weak solution) of such an embedding problem is a continuous homomorphism γ : F → H such that φ = f γ. If the solution
Embedding_problem
Scottish inventor, engineer and chemist (1736–1819)
cheaper method. He passed the chlorine into a weak solution of alkali, and obtained a turbid solution that appeared to have good bleaching properties
James_Watt
Topics referred to by the same term
groups over global fields Weak weak approximation, a form of weak approximation for varieties Weak-field approximation, a solution in general relativity This
Weak_approximation
the function u can simply be interpreted as a weak solution in the usual sense. Multipeakon solutions are formed by taking a linear combination of several
Peakon
Used in hydrology
denotes convolution with respect to x. In this formulation, it admits weak solutions with a very low degree of regularity, even discontinuous ones (shock
Degasperis–Procesi_equation
system of conservation laws converges, then it converges towards a weak solution. Lax–Wendroff method Godunov's scheme Randall J. LeVeque, Numerical
Lax–Wendroff_theorem
Species of flowering plant
relief from a normal reaction can be found with the application of a weak solution of ammonia, "Windex is a good choice" or when in remote areas that urine
Cnidoscolus_texanus
Class of partial differential equations
is subject to various notions of weak solutions, i.e., reformulating the equations in a way that allows for solutions with various irregularities (e.g
Elliptic partial differential equation
Elliptic_partial_differential_equation
Homeomorphism between plane domains
is required to be a weak solution of (1). When μ is zero almost everywhere, any homeomorphism in W1,2(D) that is a weak solution of (1) is conformal.
Quasiconformal_mapping
Chemical compound
chlorine gas through a solution of potash lye. The resulting liquid, known as "Eau de Javel" ("Javel water"), was a weak solution of potassium hypochlorite
Potassium_hypochlorite
Measure of the ability of a solution containing electrolytes to conduct electricity
Instead, the solution becomes ever more fully dissociated at weaker concentrations, and for low concentrations of "well behaved" weak electrolytes, the
Conductivity_(electrolytic)
Indicator that works over a wide range of pH
A universal indicator is a pH indicator made of a solution of several compounds that exhibit various smooth colour changes over a wide range pH values
Universal_indicator
Form of artificial intelligence
Weak artificial intelligence (weak AI) is artificial intelligence that implements a limited part of the mind, or, as narrow AI, artificial narrow intelligence
Weak_artificial_intelligence
Equation used to estimate pH of a weak acid or base solution
In chemistry and biochemistry, the pH of weakly acidic chemical solutions can be estimated using the Henderson-Hasselbalch Equation: pH = p K a + log 10
Henderson–Hasselbalch equation
Henderson–Hasselbalch_equation
Chemical element with atomic number 17 (Cl)
chlorine gas through a solution of sodium carbonate. The resulting liquid, known as "Eau de Javel" ("Javel water"), was a weak solution of sodium hypochlorite
Chlorine
Technique used on apparel for after wash effects
1986. They accidentally tumbled jeans and pumice stones wetted with a weak solution of bleach in a washing machine without water. American Garment Finishers
Stone_washing
Section 2.4 in Bensoussan is based on weak solutions of the stochastic differential equation. Considering such solutions of d x = A ( t ) x ( t ) d t + B 1
Separation principle in stochastic control
Separation_principle_in_stochastic_control
Theorem in analysis
standard argument in the calculus of variations says that y must be a weak solution of the Euler–Lagrange equation y′′(x) + y(x) = 0 with y′(0) = y′(1)
Wirtinger's inequality for functions
Wirtinger's_inequality_for_functions
Method in Itô calculus
simply called the Euler method) is a method for the approximate numerical solution of a stochastic differential equation (SDE). It is an extension of the
Euler–Maruyama_method
Chemical compound of hydrogen and oxygen
property is relied upon by all vascular plants, such as trees. Water is a weak solution of hydronium hydroxide –there is an equilibrium 2H 2O ⇌ H 3O+ + OH−
Water
Castle in Perth and Kinross, Scotland
Pillans Laurie of Heriot-Watt University in 1912. He advised using a weak solution of gelatine to fix the flaking paint pigment. Huntingtower is said to
Huntingtower_Castle
Form of electromagnetic radiation
176: "As to the infra-red rays, they may be absorbed by means of a weak solution of sulphate of copper, ..." See also: Rosenberg, Gary (2012). "Letter
Infrared
1967 film by Robert Siodmak
in Washington—and announced an impending honour for Custer. It was a weak solution, but it saved a lot of money. That's show business for you. The film
Custer_of_the_West
French chemist (1748–1822)
chlorine gas through a solution of sodium carbonate. The resulting liquid, known as "Eau de Javel" ("Javel water"), was a weak solution of sodium hypochlorite
Claude_Louis_Berthollet
Soft, brown, combustible, sedimentary rock
to a fine powder by trituration, and if submitted to the action of a weak solution of potash, it yields a considerable quantity of humic acid. Leonardite
Lignite
Type of vector space in math
possible to consider a generalized solution (known as a weak solution) by enlarging the class of functions. Many weak formulations involve the class of
Hilbert_space
Selection technique used in evolutionary algorithms
a chance some weaker solutions may survive the selection process. This is because even though the probability that the weaker solutions will survive is
Fitness proportionate selection
Fitness_proportionate_selection
Process by which the human body regulates pH
concentrations of the weak acid to the weak base. The higher the concentration of the weak acid in the solution (compared to the weak base) the lower the
Acid–base_homeostasis
Informal group of fungi
soon after production. A weak solution of water and sugar can be used to determine whether yeast is expired. In the solution, active yeast will foam and
Yeast
Solution with prescribed norm
norm. Thus, we can find the weak solution of the equation. Moreover, if it satisfies the constraint, it's a normalized solution. On a Euclidean space R 3
Normalized solution (mathematics)
Normalized_solution_(mathematics)
Russian mathematician (1908-1989)
known as distributions) were first introduced by Sobolev in 1935 for weak solutions, and further developed by Laurent Schwartz. Sobolev abstracted the classical
Sergei_Sobolev
Refrigerator that uses a heat source
the absorber, this mixture of gases contacts water (technically, a weak solution of ammonia in water). The gaseous ammonia dissolves in the water, while
Absorption_refrigerator
American mathematician (1953–2026)
Caffarelli in which they obtained partial results about the regularity of weak solutions of the Navier–Stokes equations. Kohn received a Sloan Research Fellowship
Robert_V._Kohn
Chemical reaction in which an acid and a base react quantitatively
aqueous solution at room temperature. A chemical compound may behave as a strong acid in solution when its concentration is low and as a weak acid when
Neutralization_(chemistry)
Canadian-American mathematician (1925–2020)
seminal achievement in the 1930s, formulated an influential notion of weak solution for the equations and proved their existence. His work was later put
Louis_Nirenberg
volumes of submanifolds with the given boundary. It produced a candidate weak solution to Plateau's problem. Federer, Herbert (1969), Geometric measure theory
Flat_convergence
Chemical compound
food service and water distribution, specialized equipment to generate weak solutions of HClO from water and salt is sometimes used to generate adequate quantities
Hypochlorous_acid
Sugar content of an aqueous solution
dissolved sugar content of a solution. One degree Brix is the concentration of one unit mass of solute in 100 units mass of solution, thereby representing the
Brix
H-principle Atiyah–Singer index theorem Bäcklund transform Viscosity solution Weak solution Loewy decomposition of linear differential equations Broer–Kaup
List of partial differential equation topics
List_of_partial_differential_equation_topics
Human disease
ablution; he should even wash his hands with some disinfecting fluid, a weak solution of chlorine for instance: he should avoid going in the same dress to
Postpartum_infections
Type of chemical substance
acid neutralize exactly, leaving only NaCl, effectively table salt, in solution. Weak bases, such as baking soda or egg white, should be used to neutralize
Base_(chemistry)
Russian–Israeli mathematician (1950–2020)
stochastic differential equations, is an SDE which has a weak solution but no strong solution. The Gaussian isoperimetric inequality (proved by Vladimir
Boris_Tsirelson
Chemical compound (OH–)
and barium hydroxide. A solution or suspension of calcium hydroxide is known as limewater and can be used to test for the weak acid carbon dioxide. The
Hydroxide
In mathematics, a function f {\displaystyle f} is weakly harmonic in a domain D {\displaystyle D} if ∫ D f Δ g = 0 {\displaystyle \int _{D}f\,\Delta g=0}
Weakly_harmonic_function
Concrete with rebar
produce a weak solution of hydrochloric acid due to the presence of chlorides in the magnesite. Over a period of time (typically decades), the solution causes
Reinforced_concrete
Theorem on extension of bounded linear functionals
entire codomain X. The resulting functional is often defined to be a weak solution to the equation. Theorem—A real Banach space is reflexive if and only
Hahn–Banach_theorem
Laboratory method for determining the concentration of an analyte
oxalic acid (a weak acid) and sodium hydroxide (a strong base) is pictured. The equivalence point occurs between pH 8-10, indicating the solution is basic at
Titration
Australian and American mathematician (born 1975)
found a number of novel results, many to do with the well-posedness of weak solutions, for Schrödinger equations, KdV equations, and KdV-type equations.[C+03]
Terence_Tao
WEAK SOLUTION
WEAK SOLUTION
Girl/Female
Indian
Peak
Boy/Male
Tamil
Peak
Girl/Female
Hindu, Indian, Traditional
Peak
Girl/Female
Tamil
Peak
Surname or Lastname
English
English : variant spelling of Leake.
Surname or Lastname
English
English : topographic name for someone living by a pointed hill (or regional name from the Peak District (Old English Pēaclond) in Derbyshire), named with Old English pēac ‘peak’, ‘pointed hill’ (found only in place names). This word is not directly related to Old English pīc ‘point’, ‘pointed hill’, which yielded Pike; there is, however, some evidence of confusion between the two surnames.Possibly also Irish : reduced form of McPeak.Major concentrations of the surname Peak are found in Staffordshire and the West Country of England. Among the earliest known bearers are Richard del Pech or del Pek (d. 1196), son of Rannulf, sheriff of Nottingham, and Willielmus Piec (Winchester 1194). A century later, c.1284, a certain Richard del Peke settled in Denbighshire (now part of Clwyd), Wales, receiving lands from Henry de Lacey, earl of Lincoln, in return for helping to control the region. His descendants, who bear the name Peak(e), can be traced to the present day, and are found in New Zealand and Canada as well as in Britain. Peake is also the name of a family descended from John Pyke, who paid rent to the abbot of Leicester in 1477. The name took various forms, such as Peke and Pick, eventually becoming established as Peak in the 17th century.
Boy/Male
Australian, Hindu, Indian
Peak
Boy/Male
Arabic, Muslim
Weak
Boy/Male
Arabic, Muslim
Weak
Boy/Male
Spanish
Weak.
Biblical
weak; slacked
Surname or Lastname
English
English : variant of Week.
Surname or Lastname
English (Northumbria)
English (Northumbria) : topographic name for someone who lived by the Wear river in northern England. The river name is ancient, occuring in the form Vedra in Ptolemy’s Geographia; it is probably a Celtic word meaning ‘water’.English (Northumbria) : topographic name for someone who lived near a dam or weir, a variant spelling of Ware 1, or a habitational name from a place called Weare, in Devon and Somerset, from Old English wær, wer ‘weir’.
Boy/Male
Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Sindhi, Tamil, Telugu
Peak
Boy/Male
Biblical
Weak, slacked.
Boy/Male
Hindu
Peak
Boy/Male
Hindu, Indian
Week
Boy/Male
Arabic
One who has Weak Eyes
Surname or Lastname
English
English : variant of Wick, specifically a habitational name from any of various places called Week or Weeke, notably in Cornwall, Hampshire, and Somerset.Americanized spelling of Norwegian or Swedish Vik.
Girl/Female
Australian, Christian, French, German, Hebrew
Hair; Lovelorn; Delicate; Weak
WEAK SOLUTION
WEAK SOLUTION
Girl/Female
Tamil
Lalitamohana | லலிதாமோஹநா
Attractive, Beautiful
Girl/Female
Arabic, Australian, Muslim
Respect; Honour
Boy/Male
Indian, Modern
Lucky
Boy/Male
Indian, Sanskrit
Wise
Girl/Female
Tamil
Saviour, She who frees, Another name for Durga, Goddess Parvati
Boy/Male
Indian
Karna, The great warrior, One who is born from fire (Son of the fire)
Girl/Female
Indian
Innocent
Boy/Male
Hindu, Indian
Lord of Dharma
Girl/Female
Tamil
Chitkala | சிதà¯à®•à®²à®¾
Knowledge
Surname or Lastname
English
English : habitational name from any of various places named Farley, of which there are examples in Berkshire, Derbyshire, Hampshire, Kent, Somerset, and Staffordshire, from Old English as fearn ‘fern’ + lēah ‘woodland clearing’. See also Farleigh, Fairley, Fairlie.Irish : reduced Anglicized form of Gaelic Ó Fearghaile (see Farrelly).
WEAK SOLUTION
WEAK SOLUTION
WEAK SOLUTION
WEAK SOLUTION
WEAK SOLUTION
v. t.
To cause or make by friction or wasting; as, to wear a channel; to wear a hole.
v. i.
Not stiff; pliant; frail; soft; as, the weak stalk of a plant.
v. i.
Lacking ability for an appropriate function or office; as, weak eyes; a weak stomach; a weak magistrate; a weak regiment, or army.
v. i.
Not firmly united or adhesive; easily broken or separated into pieces; not compact; as, a weak ship.
v. i.
Wanting in power to influence or bind; as, weak ties; a weak sense of honor of duty.
v. i.
Not thoroughly or abundantly impregnated with the usual or required ingredients, or with stimulating and nourishing substances; of less than the usual strength; as, weak tea, broth, or liquor; a weak decoction or solution; a weak dose of medicine.
v.
A crack, crevice, fissure, or hole which admits water or other fluid, or lets it escape; as, a leak in a roof; a leak in a boat; a leak in a gas pipe.
v. i.
Tending towards lower prices; as, a weak market.
a.
To make or become weak; to weaken.
v. i.
Lacking in elements of political strength; not wielding or having authority or energy; deficient in the resources that are essential to a ruler or nation; as, a weak monarch; a weak government or state.
v. i.
Not able to sustain a great weight, pressure, or strain; as, a weak timber; a weak rope.
n.
The upper aftermost corner of a fore-and-aft sail; -- used in many combinations; as, peak-halyards, peak-brails, etc.
a.
Having weak knees; hence, easily yielding; wanting resolution.
v. i.
Not having power to convince; not supported by force of reason or truth; unsustained; as, a weak argument or case.
v. i.
Feeble of mind; wanting discernment; lacking vigor; spiritless; as, a weak king or magistrate.
a.
Having a weak mind, either naturally or by reason of disease; feebleminded; foolish; idiotic.
v. i.
Not able to resist external force or onset; easily subdued or overcome; as, a weak barrier; as, a weak fortress.
v. i.
Not able to withstand temptation, urgency, persuasion, etc.; easily impressed, moved, or overcome; accessible; vulnerable; as, weak resolutions; weak virtue.
v. i.
To rise or extend into a peak or point; to form, or appear as, a peak.
v. i.
Wanting in point or vigor of expression; as, a weak sentence; a weak style.