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Mirrors > Home > ILE Home > Th. List > oa1suc | GIF version |
Description: Addition with 1 is same as successor. Proposition 4.34(a) of [Mendelson] p. 266. (Contributed by NM, 29-Oct-1995.) (Revised by Mario Carneiro, 16-Nov-2014.) |
Ref | Expression |
---|---|
oa1suc | ⊢ (𝐴 ∈ On → (𝐴 +o 1o) = suc 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-1o 6419 | . . . 4 ⊢ 1o = suc ∅ | |
2 | 1 | oveq2i 5888 | . . 3 ⊢ (𝐴 +o 1o) = (𝐴 +o suc ∅) |
3 | peano1 4595 | . . . 4 ⊢ ∅ ∈ ω | |
4 | onasuc 6469 | . . . 4 ⊢ ((𝐴 ∈ On ∧ ∅ ∈ ω) → (𝐴 +o suc ∅) = suc (𝐴 +o ∅)) | |
5 | 3, 4 | mpan2 425 | . . 3 ⊢ (𝐴 ∈ On → (𝐴 +o suc ∅) = suc (𝐴 +o ∅)) |
6 | 2, 5 | eqtrid 2222 | . 2 ⊢ (𝐴 ∈ On → (𝐴 +o 1o) = suc (𝐴 +o ∅)) |
7 | oa0 6460 | . . 3 ⊢ (𝐴 ∈ On → (𝐴 +o ∅) = 𝐴) | |
8 | suceq 4404 | . . 3 ⊢ ((𝐴 +o ∅) = 𝐴 → suc (𝐴 +o ∅) = suc 𝐴) | |
9 | 7, 8 | syl 14 | . 2 ⊢ (𝐴 ∈ On → suc (𝐴 +o ∅) = suc 𝐴) |
10 | 6, 9 | eqtrd 2210 | 1 ⊢ (𝐴 ∈ On → (𝐴 +o 1o) = suc 𝐴) |
Colors of variables: wff set class |
Syntax hints: → wi 4 = wceq 1353 ∈ wcel 2148 ∅c0 3424 Oncon0 4365 suc csuc 4367 ωcom 4591 (class class class)co 5877 1oc1o 6412 +o coa 6416 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-coll 4120 ax-sep 4123 ax-nul 4131 ax-pow 4176 ax-pr 4211 ax-un 4435 ax-setind 4538 ax-iinf 4589 |
This theorem depends on definitions: df-bi 117 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-ral 2460 df-rex 2461 df-reu 2462 df-rab 2464 df-v 2741 df-sbc 2965 df-csb 3060 df-dif 3133 df-un 3135 df-in 3137 df-ss 3144 df-nul 3425 df-pw 3579 df-sn 3600 df-pr 3601 df-op 3603 df-uni 3812 df-int 3847 df-iun 3890 df-br 4006 df-opab 4067 df-mpt 4068 df-tr 4104 df-id 4295 df-iord 4368 df-on 4370 df-suc 4373 df-iom 4592 df-xp 4634 df-rel 4635 df-cnv 4636 df-co 4637 df-dm 4638 df-rn 4639 df-res 4640 df-ima 4641 df-iota 5180 df-fun 5220 df-fn 5221 df-f 5222 df-f1 5223 df-fo 5224 df-f1o 5225 df-fv 5226 df-ov 5880 df-oprab 5881 df-mpo 5882 df-1st 6143 df-2nd 6144 df-recs 6308 df-irdg 6373 df-1o 6419 df-oadd 6423 |
This theorem is referenced by: o1p1e2 6471 oawordriexmid 6473 nnaordex 6531 indpi 7343 prarloclemlo 7495 |
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