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BUILT-IN MATHEMATICA SYMBOL
Element 
Element[x, dom]
or 
asserts that x is an element of the domain dom.
Element[{x1, x2, ...}, dom]
asserts that all the 
are elements of dom.
Element[patt, dom]
asserts that any expression matching the pattern patt is an element of dom.
Details
can be entered as x EscelEsc dom or 
. - Element can be used to set up assumptions in Simplify and related functions.
- Possible domains are:
-
Algebraics algebraic numbers Booleans True or False Complexes complex numbers Integers integers Primes prime numbers Rationals rational numbers Reals real numbers 
if possible evaluates immediately when x is numeric. 
is equivalent to 
. 
evaluates to 
if its truth or falsity cannot immediately be determined.
New in 4 | Last modified in 5
