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Theorem 2cnALT 12420
Description: Alternate proof of 2cn 12419. Shorter but uses more axioms. Similar proofs are possible for 3cn 12425, ... , 9cn 12444. (Contributed by NM, 30-Jul-2004.) (Proof modification is discouraged.) (New usage is discouraged.)
Assertion
Ref Expression
2cnALT 2 ∈ ℂ

Proof of Theorem 2cnALT
StepHypRef Expression
1 2re 12418 . 2 2 ∈ ℝ
21recni 11324 1 2 ∈ ℂ
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ∈ wcel 2144  ℂcc 11199  2c2 12398
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-ext 2732  ax-resscn 11258  ax-1cn 11259  ax-icn 11260  ax-addcl 11261  ax-addrcl 11262  ax-mulcl 11263  ax-mulrcl 11264  ax-i2m1 11269  ax-1ne0 11270  ax-rrecex 11273  ax-cnre 11274
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2099  df-clab 2739  df-cleq 2752  df-clel 2835  df-ne 2956  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-ss 3896  df-dif 4047  df-un 4151  df-nul 4279  df-if 4482  df-sn 4584  df-pr 4586  df-op 4590  df-uni 4867  df-br 5103  df-iota 6494  df-fv 6546  df-ov 7423  df-2 12406
This theorem is used by: (None)
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