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Theorem add1p1 12499
Description: Adding two times 1 to a number. (Contributed by AV, 22-Sep-2018.)
Assertion
Ref Expression
add1p1 (𝑁 ∈ ℂ → ((𝑁 + 1) + 1) = (𝑁 + 2))

Proof of Theorem add1p1
StepHypRef Expression
1 id 22 . . 3 (𝑁 ∈ ℂ → 𝑁 ∈ ℂ)
2 1cnd 11237 . . 3 (𝑁 ∈ ℂ → 1 ∈ ℂ)
31, 2, 2addassd 11264 . 2 (𝑁 ∈ ℂ → ((𝑁 + 1) + 1) = (𝑁 + (1 + 1)))
4 1p1e2 12372 . . . 4 (1 + 1) = 2
54a1i 11 . . 3 (𝑁 ∈ ℂ → (1 + 1) = 2)
65oveq2d 7428 . 2 (𝑁 ∈ ℂ → (𝑁 + (1 + 1)) = (𝑁 + 2))
73, 6eqtrd 2769 1 (𝑁 ∈ ℂ → ((𝑁 + 1) + 1) = (𝑁 + 2))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1539  wcel 2107  (class class class)co 7412  cc 11134  1c1 11137   + caddc 11139  2c2 12302
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1794  ax-4 1808  ax-5 1909  ax-6 1966  ax-7 2006  ax-8 2109  ax-9 2117  ax-ext 2706  ax-1cn 11194  ax-addass 11201
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1542  df-fal 1552  df-ex 1779  df-sb 2064  df-clab 2713  df-cleq 2726  df-clel 2808  df-rab 3420  df-v 3465  df-dif 3934  df-un 3936  df-ss 3948  df-nul 4314  df-if 4506  df-sn 4607  df-pr 4609  df-op 4613  df-uni 4888  df-br 5124  df-iota 6493  df-fv 6548  df-ov 7415  df-2 12310
This theorem is referenced by:  nneo  12684  ccatw2s1len  14644  chfacfscmul0  22811  chfacfscmulfsupp  22812  chfacfscmulgsum  22813  chfacfpmmul0  22815  chfacfpmmulfsupp  22816  chfacfpmmulgsum  22817  upgrwlkdvdelem  29683  poimirlem7  37568  fmtnoprmfac2  47488  fmtnofac1  47491  evenltle  47638  gpg5nbgrvtx03starlem2  47959
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