Definition df-e 15979

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 15973	. 2 class e
2		c1 11016	. . 3 class 1
3		ce 15972	. . 3 class exp
4	2, 3	cfv 6488	. 2 class (exp‘1)
5	1, 4	wceq 1541	1 wff e = (exp‘1)

This definition is referenced by:  esum  15991  ere  16000  ege2le3  16001  efzval  16015  loge  26525  logdivlti  26559  pntpbnd1a  27526  ex-co  30422  subfaclim  35255  lamberte  47015