df-e - Metamath Proof Explorer

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Definition df-e 16012

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 16006	. 2 class e
2		c1 11111	. . 3 class 1
3		ce 16005	. . 3 class exp
4	2, 3	cfv 6544	. 2 class (exp‘1)
5	1, 4	wceq 1542	1 wff e = (exp‘1)

Colors of variables: wff setvar class

This definition is referenced by: esum 16024 ere 16032 ege2le3 16033 efzval 16045 loge 26095 logdivlti 26128 pntpbnd1a 27088 ex-co 29691 subfaclim 34179