Definition df-e 11355

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 11349	. 2 class e
2		c1 7621	. . 3 class 1
3		ce 11348	. . 3 class exp
4	2, 3	cfv 5123	. 2 class (exp‘1)
5	1, 4	wceq 1331	1 wff e = (exp‘1)

This definition is referenced by:  esum  11368  ere  11376  ege2le3  11377  efzval  11389