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| Mirrors > Home > ILE Home > Th. List > 3t3e9 | GIF version | ||
| Description: 3 times 3 equals 9. (Contributed by NM, 11-May-2004.) |
| Ref | Expression |
|---|---|
| 3t3e9 | ⊢ (3 · 3) = 9 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-3 9367 | . . 3 ⊢ 3 = (2 + 1) | |
| 2 | 1 | oveq2i 6096 | . 2 ⊢ (3 · 3) = (3 · (2 + 1)) |
| 3 | 3cn 9382 | . . . . 5 ⊢ 3 ∈ ℂ | |
| 4 | 2cn 9378 | . . . . 5 ⊢ 2 ∈ ℂ | |
| 5 | ax-1cn 8273 | . . . . 5 ⊢ 1 ∈ ℂ | |
| 6 | 3, 4, 5 | adddii 8337 | . . . 4 ⊢ (3 · (2 + 1)) = ((3 · 2) + (3 · 1)) |
| 7 | 3t2e6 9464 | . . . . 5 ⊢ (3 · 2) = 6 | |
| 8 | 3t1e3 9463 | . . . . 5 ⊢ (3 · 1) = 3 | |
| 9 | 7, 8 | oveq12i 6097 | . . . 4 ⊢ ((3 · 2) + (3 · 1)) = (6 + 3) |
| 10 | 6, 9 | eqtri 2259 | . . 3 ⊢ (3 · (2 + 1)) = (6 + 3) |
| 11 | 6p3e9 9458 | . . 3 ⊢ (6 + 3) = 9 | |
| 12 | 10, 11 | eqtri 2259 | . 2 ⊢ (3 · (2 + 1)) = 9 |
| 13 | 2, 12 | eqtri 2259 | 1 ⊢ (3 · 3) = 9 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: = wceq 1402 (class class class)co 6085 1c1 8181 + caddc 8183 · cmul 8185 2c2 9358 3c3 9359 6c6 9362 9c9 9365 |
| 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-resscn 8272 ax-1cn 8273 ax-1re 8274 ax-icn 8275 ax-addcl 8276 ax-addrcl 8277 ax-mulcl 8278 ax-mulcom 8281 ax-addass 8282 ax-mulass 8283 ax-distr 8284 ax-1rid 8287 ax-cnre 8291 |
| 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-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4131 df-iota 5337 df-fv 5385 df-ov 6088 df-2 9366 df-3 9367 df-4 9368 df-5 9369 df-6 9370 df-7 9371 df-8 9372 df-9 9373 |
| This theorem is used by: sq3 11088 3dvds 12650 3dvdsdec 12651 3dvds2dec 12652 9nprm 13250 11prm 13252 43prm 13259 83prm 13260 317prm 13263 1259lem2 13266 1259lem4 13268 1259prm 13270 log2tlbndlog2 16181 log2ublem3 16184 log2ublog2 16185 bposlem9 16280 lgsdir2lem5 16317 |
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