Theorem ene0

Description: _e is not 0. (Contributed by David A. Wheeler, 17-Oct-2017)

	Ref	Expression
Assertion	ene0	|- _e =/= 0

Proof

Step	Hyp	Ref	Expression
1		ere	|- _e e. RR
2		epos	|- 0 < _e
3	1 2	gt0ne0ii	|- _e =/= 0