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An equation is any statement with an equals sign in it. Equations come in a variety of flavours. A simple (and simplistic) classification of equations could include: COLUMN_START^ [[[ !! Equations Mathematical statement which is true for a limited number of values of its variable. * EQN:3x+2=-7 is true for one value of the variable x * EQN:sin(x)=0.5 is true for an infinite number but not all of values of x ]]] COLUMN_SPLIT^ [[[ !! Identities Statements which are true for all values of the variable. * EQN:3(x+2)=3x+6 * EQN:2^n=\sum_{i=0}^{i=n}{n\choose~i} ]]] COLUMN_SPLIT^ [[[ !! Propositions Statements which are either true or false * 2 + 3 = 5 * 1 + 1 = 3 ]]] COLUMN_END However, this classification does not include differential equations, integral equations, functions, /etc./