Theorem add1p1 12372

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

Step	Hyp	Ref	Expression
1		id 22	. . 3 ⊢ (𝑁 ∈ ℂ → 𝑁 ∈ ℂ)
2		1cnd 11107	. . 3 ⊢ (𝑁 ∈ ℂ → 1 ∈ ℂ)
3	1, 2, 2	addassd 11134	. 2 ⊢ (𝑁 ∈ ℂ → ((𝑁 + 1) + 1) = (𝑁 + (1 + 1)))
4		1p1e2 12245	. . . 4 ⊢ (1 + 1) = 2
5	4	a1i 11	. . 3 ⊢ (𝑁 ∈ ℂ → (1 + 1) = 2)
6	5	oveq2d 7362	. 2 ⊢ (𝑁 ∈ ℂ → (𝑁 + (1 + 1)) = (𝑁 + 2))
7	3, 6	eqtrd 2766	1 ⊢ (𝑁 ∈ ℂ → ((𝑁 + 1) + 1) = (𝑁 + 2))

Syntax hints:   → wi 4   = wceq 1541   ∈ wcel 2111  (class class class)co 7346  ℂcc 11004  1c1 11007   + caddc 11009  2c2 12180

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2113  ax-9 2121  ax-ext 2703  ax-1cn 11064  ax-addass 11071

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-sb 2068  df-clab 2710  df-cleq 2723  df-clel 2806  df-rab 3396  df-v 3438  df-dif 3900  df-un 3902  df-ss 3914  df-nul 4281  df-if 4473  df-sn 4574  df-pr 4576  df-op 4580  df-uni 4857  df-br 5090  df-iota 6437  df-fv 6489  df-ov 7349  df-2 12188

This theorem is referenced by:  nneo  12557  ccatw2s1len  14533  chfacfscmul0  22773  chfacfscmulfsupp  22774  chfacfscmulgsum  22775  chfacfpmmul0  22777  chfacfpmmulfsupp  22778  chfacfpmmulgsum  22779  upgrwlkdvdelem  29714  poimirlem7  37677  fmtnoprmfac2  47677  fmtnofac1  47680  evenltle  47827  gpg5nbgrvtx03starlem2  48179