This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
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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.
  • The assumptions can be equations, inequalities or domain specifications, or lists or logical combinations of these.
  • 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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