equations

This article is about equations in mathematics. For equations in chemistry, see chemical equation.''In mathematics, one often (not quite always) distinguishes between an identity (mathematics)identity, which is an assertion that two expression (mathematics)expressions are equality (mathematics)equal regardless of the values of any variables that occur within them, and an equation, which may be true (logic)true for only some (or none) of the values of any such variables.In equations, the values of the variables for which the equation is true are called ''solutions''.For example:$(x+1)^2\; =\; x^2\; +\; 2x\; +\; 1$is an identity, while:$x^2\; -\; 5x\; +\; 6\; =\; 0$is an equation, whose solutions are ''x'' = 2 or ''x'' = 3.Letters from the beginning of the alphabet like ''a'', ''b'', ''c'', ... are often considered constants in the context of the discussion at hand, while letters from end of the alphabet, like ''x'', ''y'', ''z'', are usually considered variables.Thus to equation solvingsolve the equation, one must find what values fulfill the condition stated as an equation.

See also -

Linear equation

Quadratic equation

Cubic equation

Biquadratic equation

Inequality

Solution point

Differential equation

Integral equation

Functional equation

Diophantine equation

List of equations

External links -

Free Online Equation Interpreter and Plotter: wessa.net - ''Mathematical Equation Plotter''. Plots 2D mathematical equations, computes integrals, and finds solutions.

Solve 2D equations graphically and numerically: deadline.3x.ro - ''DeadLine''. Free Windows software.

eqworld.ipmnet.ru - Algebraic Equations and Systems of Algebraic Equations at EqWorld: The World of Mathematical Equations.Category:Elementary !algebraCategory:Equationsbn:� �মীকরণca:Equaciócs: Rovniceda:Ligningde:Gleichunge s:Ecuacióneo:Ekvaciofr:Équat ionko:방정식io:Equacionoit: Equazionehe:משוואהnl:Ver gelijking? !(wiskunde)ja:方程式no:Ligni ngnn:Likningpl:Równanie? !matematycznept:Equaçãoro:Ecu aţieru:Уравнениеsimp le:Equationsk:Rovnica? !(matematika)sv:Ekvationvi:Phư ơng? !trìnhuk:Рівнянняzh:� �程 DEBUG REDIRECT (equation)

Pharmacokinetcs data analysis software for research and education.
Pharmaceutical and medical software for evaluation of pharmacokinetic parameters in research and educational organizations.
http://www.summitpk.com/

Electronic Journal of Differential Equations
Full text available in DVI, PDF, PS and TeX formats. Searchable index.
http://ejde.math.swt.edu/

The Constants and Equations Pages
Expanding reference resource for science, math and astronomy
http://www.tcaep.co.uk/

ScienceDirect
Research papers published on the net , subscription required for some sections.
http://www.sciencedirect.com

S.O.S. Math
Contains tutorials covering algebra, geometry, calculus, differential equations, matrices, and complex variables. Reviews the most important results, techniques and formulas. Presented in worksheet format and require active participation. Includes practice quizzes and forum board.
http://www.sosmath.com/