Definition df-e 16003

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 15997	. 2 class e
2		c1 11039	. . 3 class 1
3		ce 15996	. . 3 class exp
4	2, 3	cfv 6500	. 2 class (exp‘1)
5	1, 4	wceq 1542	1 wff e = (exp‘1)

This definition is referenced by:  esum  16015  ere  16024  ege2le3  16025  efzval  16039  loge  26563  logdivlti  26597  pntpbnd1a  27564  ex-co  30525  subfaclim  35401  lamberte  47245