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| Mirrors > Home > MPE Home > Th. List > oa1suc | Structured version Visualization version GIF version | ||
| Description: Addition with 1 is same as successor. Proposition 4.34(a) of [Mendelson] p. 266. Remark 2.4 of [Schloeder] p. 4. (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 8449 | . . . 4 ⊢ 1o = suc ∅ | |
| 2 | 1 | oveq2i 7421 | . . 3 ⊢ (𝐴 +o 1o) = (𝐴 +o suc ∅) |
| 3 | peano1 7881 | . . . 4 ⊢ ∅ ∈ ω | |
| 4 | onasuc 8509 | . . . 4 ⊢ ((𝐴 ∈ On ∧ ∅ ∈ ω) → (𝐴 +o suc ∅) = suc (𝐴 +o ∅)) | |
| 5 | 3, 4 | mpan2 703 | . . 3 ⊢ (𝐴 ∈ On → (𝐴 +o suc ∅) = suc (𝐴 +o ∅)) |
| 6 | 2, 5 | eqtrid 2810 | . 2 ⊢ (𝐴 ∈ On → (𝐴 +o 1o) = suc (𝐴 +o ∅)) |
| 7 | oa0 8497 | . . 3 ⊢ (𝐴 ∈ On → (𝐴 +o ∅) = 𝐴) | |
| 8 | suceq 6429 | . . 3 ⊢ ((𝐴 +o ∅) = 𝐴 → suc (𝐴 +o ∅) = suc 𝐴) | |
| 9 | 7, 8 | syl 18 | . 2 ⊢ (𝐴 ∈ On → suc (𝐴 +o ∅) = suc 𝐴) |
| 10 | 6, 9 | eqtrd 2798 | 1 ⊢ (𝐴 ∈ On → (𝐴 +o 1o) = suc 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1570 ∈ wcel 2143 ∅c0 4286 Oncon0 6360 suc csuc 6362 (class class class)co 7410 ωcom 7858 1oc1o 8442 +o coa 8446 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1825 ax-4 1839 ax-5 1940 ax-6 1997 ax-7 2038 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5257 ax-nul 5269 ax-pr 5404 ax-un 7732 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1810 df-nf 1814 df-sb 2097 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-reu 3370 df-rab 3417 df-v 3457 df-sbc 3745 df-csb 3854 df-dif 3908 df-un 3910 df-in 3912 df-ss 3922 df-pss 3925 df-nul 4287 df-if 4488 df-pw 4564 df-sn 4590 df-pr 4592 df-op 4596 df-uni 4873 df-iun 4958 df-br 5110 df-opab 5174 df-mpt 5193 df-tr 5219 df-id 5556 df-eprel 5561 df-po 5569 df-so 5570 df-fr 5614 df-we 5616 df-xp 5667 df-rel 5668 df-cnv 5669 df-co 5670 df-dm 5671 df-rn 5672 df-res 5673 df-ima 5674 df-pred 6302 df-ord 6363 df-on 6364 df-lim 6365 df-suc 6366 df-iota 6492 df-fun 6538 df-fn 6539 df-f 6540 df-f1 6541 df-fo 6542 df-f1o 6543 df-fv 6544 df-ov 7413 df-oprab 7414 df-mpo 7415 df-om 7859 df-2nd 7983 df-frecs 8274 df-wrecs 8305 df-recs 8354 df-rdg 8393 df-1o 8449 df-oadd 8453 |
| This theorem is referenced by: o1p1e2 8521 o2p2e4 8522 om1r 8524 omlimcl 8559 oneo 8562 oeeui 8584 nnneo 8637 nneob 8638 oancom 9616 ttrcltr 9681 indpi 10887 om2noseqlt 28492 oaabsb 44041 oa1un 44192 tr3dom 44274 sucomisnotcard 44290 nna1iscard 44291 hashnnsuc 45749 |
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