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Theorem nnaddcld 9352
Description: Closure of addition of positive integers. (Contributed by Mario Carneiro, 27-May-2016.)
Hypotheses
Ref Expression
nnge1d.1 (𝜑𝐴 ∈ ℕ)
nnmulcld.2 (𝜑𝐵 ∈ ℕ)
Assertion
Ref Expression
nnaddcld (𝜑 → (𝐴 + 𝐵) ∈ ℕ)

Proof of Theorem nnaddcld
StepHypRef Expression
1 nnge1d.1 . 2 (𝜑𝐴 ∈ ℕ)
2 nnmulcld.2 . 2 (𝜑𝐵 ∈ ℕ)
3 nnaddcl 9324 . 2 ((𝐴 ∈ ℕ ∧ 𝐵 ∈ ℕ) → (𝐴 + 𝐵) ∈ ℕ)
41, 2, 3syl2anc 415 1 (𝜑 → (𝐴 + 𝐵) ∈ ℕ)
Colors of variables:    wff set class
This proof depends on syntax axioms:  wi 4  wcel 2209  (class class class)co 6085   + caddc 8182  cn 9304
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-ext 2220  ax-sep 4249  ax-cnex 8270  ax-resscn 8271  ax-1cn 8272  ax-1re 8273  ax-addrcl 8276  ax-addass 8281
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-rab 2537  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-int 3971  df-br 4131  df-iota 5337  df-fv 5385  df-ov 6088  df-inn 9305
This theorem is used by:  pythagtriplem4  13047  pythagtriplem6  13049  pythagtriplem7  13050  pythagtriplem11  13053  pythagtriplem12  13054  pythagtriplem13  13055  pythagtriplem14  13056  pythagtriplem15  13057  pythagtriplem16  13058  ballotfilem5  13242  mulgnndir  13954  perfectlem2  16114  lgseisenlem2  16190
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