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| Mirrors > Home > ILE Home > Th. List > nn0nnaddcl | GIF version | ||
| Description: A nonnegative integer plus a positive integer is a positive integer. (Contributed by NM, 22-Dec-2005.) |
| Ref | Expression |
|---|---|
| nn0nnaddcl | ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑁 ∈ ℕ) → (𝑀 + 𝑁) ∈ ℕ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nncn 9312 | . . . 4 ⊢ (𝑁 ∈ ℕ → 𝑁 ∈ ℂ) | |
| 2 | nn0cn 9573 | . . . 4 ⊢ (𝑀 ∈ ℕ0 → 𝑀 ∈ ℂ) | |
| 3 | addcom 8463 | . . . 4 ⊢ ((𝑁 ∈ ℂ ∧ 𝑀 ∈ ℂ) → (𝑁 + 𝑀) = (𝑀 + 𝑁)) | |
| 4 | 1, 2, 3 | syl2an 289 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ 𝑀 ∈ ℕ0) → (𝑁 + 𝑀) = (𝑀 + 𝑁)) |
| 5 | nnnn0addcl 9593 | . . 3 ⊢ ((𝑁 ∈ ℕ ∧ 𝑀 ∈ ℕ0) → (𝑁 + 𝑀) ∈ ℕ) | |
| 6 | 4, 5 | eqeltrrd 2316 | . 2 ⊢ ((𝑁 ∈ ℕ ∧ 𝑀 ∈ ℕ0) → (𝑀 + 𝑁) ∈ ℕ) |
| 7 | 6 | ancoms 268 | 1 ⊢ ((𝑀 ∈ ℕ0 ∧ 𝑁 ∈ ℕ) → (𝑀 + 𝑁) ∈ ℕ) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 104 = wceq 1402 ∈ wcel 2209 (class class class)co 6085 ℂcc 8177 + caddc 8182 ℕcn 9304 ℕ0cn0 9563 |
| 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-icn 8274 ax-addcl 8275 ax-addrcl 8276 ax-mulcl 8277 ax-addcom 8279 ax-addass 8281 ax-i2m1 8284 ax-0id 8287 ax-rnegex 8288 |
| 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 df-n0 9564 |
| This theorem is used by: nn0p1nn 9602 nnaddm1cl 9706 numnncl 9786 modfzo0difsn 10832 |
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