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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 9366 | . . 3 ⊢ 3 = (2 + 1) | |
| 2 | 1 | oveq2i 6096 | . 2 ⊢ (3 · 3) = (3 · (2 + 1)) |
| 3 | 3cn 9381 | . . . . 5 ⊢ 3 ∈ ℂ | |
| 4 | 2cn 9377 | . . . . 5 ⊢ 2 ∈ ℂ | |
| 5 | ax-1cn 8272 | . . . . 5 ⊢ 1 ∈ ℂ | |
| 6 | 3, 4, 5 | adddii 8336 | . . . 4 ⊢ (3 · (2 + 1)) = ((3 · 2) + (3 · 1)) |
| 7 | 3t2e6 9463 | . . . . 5 ⊢ (3 · 2) = 6 | |
| 8 | 3t1e3 9462 | . . . . 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 9457 | . . 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 8180 + caddc 8182 · cmul 8184 2c2 9357 3c3 9358 6c6 9361 9c9 9364 |
| 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 8271 ax-1cn 8272 ax-1re 8273 ax-icn 8274 ax-addcl 8275 ax-addrcl 8276 ax-mulcl 8277 ax-mulcom 8280 ax-addass 8281 ax-mulass 8282 ax-distr 8283 ax-1rid 8286 ax-cnre 8290 |
| 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 9365 df-3 9366 df-4 9367 df-5 9368 df-6 9369 df-7 9370 df-8 9371 df-9 9372 |
| This theorem is used by: sq3 11086 3dvds 12647 3dvdsdec 12648 3dvds2dec 12649 9nprm 13247 11prm 13249 43prm 13256 83prm 13257 317prm 13260 1259lem2 13263 1259lem4 13265 1259prm 13267 log2tlbndlog2 16139 log2ublem3 16142 log2ublog2 16143 lgsdir2lem5 16249 |
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