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| Description: Addition with 1 is same as successor. Proposition 4.34(a) of [Mendelson] p. 266. |
| Ref | Expression |
|---|---|
| oa1suc |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0elon 3018 |
. . . 4
| |
| 2 | oasuc 4156 |
. . . 4
| |
| 3 | 1, 2 | mpan2 695 |
. . 3
|
| 4 | df-1o 4126 |
. . . 4
| |
| 5 | 4 | opreq2i 3967 |
. . 3
|
| 6 | 3, 5 | syl5eq 1517 |
. 2
|
| 7 | oa0 4148 |
. . 3
| |
| 8 | suceq 3030 |
. . 3
| |
| 9 | 7, 8 | syl 10 |
. 2
|
| 10 | 6, 9 | eqtrd 1505 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: o1p1e2 4168 om1r 4170 omlimcl 4202 oneo 4205 nneob 4248 oancom 4616 indpi 5017 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 961 ax-gen 962 ax-8 963 ax-9 964 ax-10 965 ax-11 966 ax-12 967 ax-13 968 ax-14 969 ax-17 970 ax-4 972 ax-5o 974 ax-6o 977 ax-9o 1122 ax-10o 1139 ax-16 1209 ax-11o 1217 ax-ext 1458 ax-rep 2689 ax-sep 2699 ax-nul 2706 ax-pow 2738 ax-pr 2775 ax-un 2862 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3or 775 df-3an 776 df-ex 980 df-sb 1171 df-eu 1381 df-mo 1382 df-clab 1463 df-cleq 1468 df-clel 1471 df-ne 1585 df-ral 1647 df-rex 1648 df-rab 1650 df-v 1809 df-sbc 1939 df-csb 1999 df-dif 2046 df-un 2047 df-in 2048 df-ss 2050 df-nul 2278 df-if 2359 df-pw 2399 df-sn 2409 df-pr 2410 df-tp 2412 df-op 2413 df-uni 2500 df-iun 2564 df-br 2616 df-opab 2663 df-tr 2677 df-eprel 2828 df-id 2831 df-po 2836 df-so 2846 df-fr 2913 df-we 2930 df-ord 2947 df-on 2948 df-lim 2949 df-suc 2950 df-xp 3180 df-rel 3181 df-cnv 3182 df-co 3183 df-dm 3184 df-rn 3185 df-res 3186 df-ima 3187 df-fun 3188 df-fn 3189 df-fv 3194 df-rdg 3927 df-opr 3960 df-oprab 3961 df-1o 4126 df-oadd 4128 |