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| Mirrors > Home > ILE Home > Th. List > 8p2e10 | GIF version | ||
| Description: 8 + 2 = 10. (Contributed by NM, 5-Feb-2007.) (Revised by Stanislas Polu, 7-Apr-2020.) (Revised by AV, 6-Sep-2021.) |
| Ref | Expression |
|---|---|
| 8p2e10 | ⊢ (8 + 2) = ;10 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-2 9372 | . . . 4 ⊢ 2 = (1 + 1) | |
| 2 | 1 | oveq2i 6099 | . . 3 ⊢ (8 + 2) = (8 + (1 + 1)) |
| 3 | 8cn 9399 | . . . 4 ⊢ 8 ∈ ℂ | |
| 4 | ax-1cn 8278 | . . . 4 ⊢ 1 ∈ ℂ | |
| 5 | 3, 4, 4 | addassi 8340 | . . 3 ⊢ ((8 + 1) + 1) = (8 + (1 + 1)) |
| 6 | 2, 5 | eqtr4i 2262 | . 2 ⊢ (8 + 2) = ((8 + 1) + 1) |
| 7 | df-9 9379 | . . 3 ⊢ 9 = (8 + 1) | |
| 8 | 7 | oveq1i 6098 | . 2 ⊢ (9 + 1) = ((8 + 1) + 1) |
| 9 | 9p1e10 9790 | . 2 ⊢ (9 + 1) = ;10 | |
| 10 | 6, 8, 9 | 3eqtr2i 2265 | 1 ⊢ (8 + 2) = ;10 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: = wceq 1402 (class class class)co 6088 0cc0 8185 1c1 8186 + caddc 8188 2c2 9364 8c8 9370 9c9 9371 ;cdc 9788 |
| 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 4251 ax-cnex 8276 ax-resscn 8277 ax-1cn 8278 ax-1re 8279 ax-icn 8280 ax-addcl 8281 ax-addrcl 8282 ax-mulcl 8283 ax-mulcom 8286 ax-addass 8287 ax-mulass 8288 ax-distr 8289 ax-1rid 8292 ax-0id 8293 ax-cnre 8296 |
| 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 4132 df-iota 5340 df-fv 5388 df-ov 6091 df-inn 9314 df-2 9372 df-3 9373 df-4 9374 df-5 9375 df-6 9376 df-7 9377 df-8 9378 df-9 9379 df-dec 9789 |
| This theorem is used by: 8p3e11 9873 8t5e40 9910 1259lem3 13273 1259lem4 13274 |
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