Definition df-e 16123

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 16117	. 2 class e
2		c1 11102	. . 3 class 1
3		ce 16116	. . 3 class exp
4	2, 3	cfv 6538	. 2 class (exp‘1)
5	1, 4	wceq 1570	1 wff e = (exp‘1)

This definition is referenced by:  esum  16135  ere  16144  ege2le3  16145  efzval  16159  loge  26732  logdivlti  26766  pntpbnd1a  27730  ex-co  30770  subfaclim  35661  lamberte  47608