Definition df-e 14799

Description: Define Euler's constant 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 14793	. 2 class _e
2		c1 9937	. . 3 class 1
3		ce 14792	. . 3 class exp
4	2, 3	cfv 5888	. 2 class ( exp ` 1 )
5	1, 4	wceq 1483	1 wff _e = ( exp ` 1 )

This definition is referenced by:  esum  14811  ere  14819  ege2le3  14820  efzval  14832  loge  24333  logdivlti  24366  emgt0  24733  pntpbnd1a  25274  ex-co  27295  subfaclim  31170