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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 9373 | . . 3 ⊢ 3 = (2 + 1) | |
| 2 | 1 | oveq2i 6099 | . 2 ⊢ (3 · 3) = (3 · (2 + 1)) |
| 3 | 3cn 9388 | . . . . 5 ⊢ 3 ∈ ℂ | |
| 4 | 2cn 9384 | . . . . 5 ⊢ 2 ∈ ℂ | |
| 5 | ax-1cn 8278 | . . . . 5 ⊢ 1 ∈ ℂ | |
| 6 | 3, 4, 5 | adddii 8342 | . . . 4 ⊢ (3 · (2 + 1)) = ((3 · 2) + (3 · 1)) |
| 7 | 3t2e6 9470 | . . . . 5 ⊢ (3 · 2) = 6 | |
| 8 | 3t1e3 9469 | . . . . 5 ⊢ (3 · 1) = 3 | |
| 9 | 7, 8 | oveq12i 6100 | . . . 4 ⊢ ((3 · 2) + (3 · 1)) = (6 + 3) |
| 10 | 6, 9 | eqtri 2259 | . . 3 ⊢ (3 · (2 + 1)) = (6 + 3) |
| 11 | 6p3e9 9464 | . . 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 6088 1c1 8186 + caddc 8188 · cmul 8190 2c2 9364 3c3 9365 6c6 9368 9c9 9371 |
| 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 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-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-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 4132 df-iota 5340 df-fv 5388 df-ov 6091 df-2 9372 df-3 9373 df-4 9374 df-5 9375 df-6 9376 df-7 9377 df-8 9378 df-9 9379 |
| This theorem is used by: sq3 11094 3dvds 12656 3dvdsdec 12657 3dvds2dec 12658 9nprm 13256 11prm 13258 43prm 13265 83prm 13266 317prm 13269 1259lem2 13272 1259lem4 13274 1259prm 13276 log2tlbndlog2 16220 log2ublem3 16223 log2ublog2 16224 bposlem9 16319 lgsdir2lem5 16356 |
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