Definition df-e 11590

Description: Define Euler's constant _e = 2.71828.... (Contributed by NM, 14-Mar-2005.)

Assertion

Ref	Expression
df-e	|- _e = ( exp ` 1 )

Detailed syntax breakdown of Definition df-e

Step	Hyp	Ref	Expression
1		ceu 11584	. 2 class _e
2		c1 7754	. . 3 class 1
3		ce 11583	. . 3 class exp
4	2, 3	cfv 5188	. 2 class ( exp ` 1 )
5	1, 4	wceq 1343	1 wff _e = ( exp ` 1 )

This definition is referenced by:  esum  11603  ere  11611  ege2le3  11612  efzval  11624  reeff1oleme  13333  loge  13428  logdivlti  13442