Definition df-e 12418

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 12412	. 2 class e
2		c1 8180	. . 3 class 1
3		ce 12411	. . 3 class exp
4	2, 3	cfv 5377	. 2 class (exp‘1)
5	1, 4	wceq 1402	1 wff e = (exp‘1)

This definition is used by:  esum  12431  ere  12439  ege2le3  12440  efzval  12452  reeff1oleme  15875  loge  15971  logdivlti  15986