Reals
 Usage
• Reals 代表实数域,表示为 x  Reals.
Notes
• 只有当 x是一个数值时, x  Reals才立即进行计算. • Simplify[expr  Reals]可以用来确定一个表达式是否是实数. • 在Simplify及类似函数的内部,满足不等式的对象总被视为实数. • 在 TraditionalForm中, Reals输出为  .
 Further Examples
Here are two numbers, one real and one not.
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In assumptions, variables in inequalities are assumed to be real.
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