Definition df-e 12399

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 12393	. 2 class e
2		c1 8174	. . 3 class 1
3		ce 12392	. . 3 class exp
4	2, 3	cfv 5375	. 2 class (exp‘1)
5	1, 4	wceq 1402	1 wff e = (exp‘1)

This definition is referenced by:  esum  12412  ere  12420  ege2le3  12421  efzval  12433  reeff1oleme  15856  loge  15951  logdivlti  15965