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Definition df-e 11657
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
StepHypRef Expression
1 ceu 11651 . 2  class  _e
2 c1 7812 . . 3  class  1
3 ce 11650 . . 3  class  exp
42, 3cfv 5217 . 2  class  ( exp `  1 )
51, 4wceq 1353 1  wff  _e  =  ( exp `  1 )
Colors of variables: wff set class
This definition is referenced by:  esum  11670  ere  11678  ege2le3  11679  efzval  11691  reeff1oleme  14196  loge  14291  logdivlti  14305
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