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| Mirrors > Home > MPE Home > Th. List > addcompi | Structured version Visualization version GIF version | ||
| Description: Addition of positive integers is commutative. (Contributed by NM, 27-Aug-1995.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| addcompi | ⊢ (𝐴 +N 𝐵) = (𝐵 +N 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pinn 10890 | . . . 4 ⊢ (𝐴 ∈ N → 𝐴 ∈ ω) | |
| 2 | pinn 10890 | . . . 4 ⊢ (𝐵 ∈ N → 𝐵 ∈ ω) | |
| 3 | nnacom 8608 | . . . 4 ⊢ ((𝐴 ∈ ω ∧ 𝐵 ∈ ω) → (𝐴 +o 𝐵) = (𝐵 +o 𝐴)) | |
| 4 | 1, 2, 3 | syl2an 608 | . . 3 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 +o 𝐵) = (𝐵 +o 𝐴)) |
| 5 | addpiord 10896 | . . 3 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 +N 𝐵) = (𝐴 +o 𝐵)) | |
| 6 | addpiord 10896 | . . . 4 ⊢ ((𝐵 ∈ N ∧ 𝐴 ∈ N) → (𝐵 +N 𝐴) = (𝐵 +o 𝐴)) | |
| 7 | 6 | ancoms 464 | . . 3 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐵 +N 𝐴) = (𝐵 +o 𝐴)) |
| 8 | 4, 5, 7 | 3eqtr4d 2807 | . 2 ⊢ ((𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 +N 𝐵) = (𝐵 +N 𝐴)) |
| 9 | dmaddpi 10902 | . . 3 ⊢ dom +N = (N × N) | |
| 10 | 9 | ndmovcom 7604 | . 2 ⊢ (¬ (𝐴 ∈ N ∧ 𝐵 ∈ N) → (𝐴 +N 𝐵) = (𝐵 +N 𝐴)) |
| 11 | 8, 10 | pm2.61i 184 | 1 ⊢ (𝐴 +N 𝐵) = (𝐵 +N 𝐴) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ∧ wa 401 = wceq 1570 ∈ wcel 2145 (class class class)co 7416 ωcom 7865 +o coa 8455 Ncnpi 10856 +N cpli 10857 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pr 5402 ax-un 7739 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-ral 3079 df-rex 3089 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-pss 3922 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-tr 5217 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-we 5614 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-pred 6303 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-ov 7419 df-oprab 7420 df-mpo 7421 df-om 7866 df-1st 7989 df-2nd 7990 df-frecs 8283 df-wrecs 8314 df-recs 8363 df-rdg 8402 df-oadd 8462 df-ni 10884 df-pli 10885 |
| This theorem is used by: addcompq 10962 adderpqlem 10966 |
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