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Mathematica > Assumptions and Domains >

Built-in Mathematica Symbol

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Assumptions

Assumptions
is an option for functions such as Simplify, Refine and Integrate which specifies default assumptions to be made about symbolic quantities.

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The default setting is Assumptions:>$Assumptions.

The assumptions can be equations, inequalities or domain specifications, or lists or logical combinations of these.

Assuming modifies $Assumptions and so modifies the value of default settings for Assumptions options.

xReals can be used to specify that x should be treated as a real variable.

Quantities that appear algebraically in inequalities are always assumed to be real.

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