Definition df-e 15991

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 15985	. 2 class e
2		c1 11027	. . 3 class 1
3		ce 15984	. . 3 class exp
4	2, 3	cfv 6492	. 2 class (exp‘1)
5	1, 4	wceq 1541	1 wff e = (exp‘1)

This definition is referenced by:  esum  16003  ere  16012  ege2le3  16013  efzval  16027  loge  26551  logdivlti  26585  pntpbnd1a  27552  ex-co  30513  subfaclim  35382  lamberte  47134