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= means two lines cross, and you work out what x value they cross at; ie, they’re equal at one or more point. Identity means they’re the same line, ie they’re equal for all x. In this particular example they mean ∀x f (x)=g (x)
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List of all math symbols and meaning - equality, inequality, parentheses, plus, minus, times, division, power, square root, percent, per mille,...
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√x is a nonnegative number whose square is x. A⇒B means that if A is true, B must also be true, but if A is false, B is unknown. x=3⇒x 2 =9, but x 2 =9⇒x=3 is false, because x could also be -3. If A is true, B is true and if A is false, B is false. |x| is the distance along the real line (or across the complex plane) between x and zero.
A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various types, many symbols are needed for ...
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