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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 9343 | . . 3 ⊢ 3 = (2 + 1) | |
| 2 | 1 | oveq2i 6086 | . 2 ⊢ (3 · 3) = (3 · (2 + 1)) |
| 3 | 3cn 9358 | . . . . 5 ⊢ 3 ∈ ℂ | |
| 4 | 2cn 9354 | . . . . 5 ⊢ 2 ∈ ℂ | |
| 5 | ax-1cn 8262 | . . . . 5 ⊢ 1 ∈ ℂ | |
| 6 | 3, 4, 5 | adddii 8326 | . . . 4 ⊢ (3 · (2 + 1)) = ((3 · 2) + (3 · 1)) |
| 7 | 3t2e6 9440 | . . . . 5 ⊢ (3 · 2) = 6 | |
| 8 | 3t1e3 9439 | . . . . 5 ⊢ (3 · 1) = 3 | |
| 9 | 7, 8 | oveq12i 6087 | . . . 4 ⊢ ((3 · 2) + (3 · 1)) = (6 + 3) |
| 10 | 6, 9 | eqtri 2259 | . . 3 ⊢ (3 · (2 + 1)) = (6 + 3) |
| 11 | 6p3e9 9434 | . . 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 |
| Syntax hints: = wceq 1402 (class class class)co 6075 1c1 8170 + caddc 8172 · cmul 8174 2c2 9334 3c3 9335 6c6 9338 9c9 9341 |
| This theorem was proved from 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 8261 ax-1cn 8262 ax-1re 8263 ax-icn 8264 ax-addcl 8265 ax-addrcl 8266 ax-mulcl 8267 ax-mulcom 8270 ax-addass 8271 ax-mulass 8272 ax-distr 8273 ax-1rid 8276 ax-cnre 8280 |
| This theorem 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 3711 df-pr 3712 df-op 3714 df-uni 3931 df-br 4126 df-iota 5332 df-fv 5380 df-ov 6078 df-2 9342 df-3 9343 df-4 9344 df-5 9345 df-6 9346 df-7 9347 df-8 9348 df-9 9349 |
| This theorem is referenced by: sq3 11051 3dvds 12609 3dvdsdec 12610 3dvds2dec 12611 lgsdir2lem5 16065 |
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