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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 9096 | . . 3 ⊢ 3 = (2 + 1) | |
| 2 | 1 | oveq2i 5955 | . 2 ⊢ (3 · 3) = (3 · (2 + 1)) |
| 3 | 3cn 9111 | . . . . 5 ⊢ 3 ∈ ℂ | |
| 4 | 2cn 9107 | . . . . 5 ⊢ 2 ∈ ℂ | |
| 5 | ax-1cn 8018 | . . . . 5 ⊢ 1 ∈ ℂ | |
| 6 | 3, 4, 5 | adddii 8082 | . . . 4 ⊢ (3 · (2 + 1)) = ((3 · 2) + (3 · 1)) |
| 7 | 3t2e6 9193 | . . . . 5 ⊢ (3 · 2) = 6 | |
| 8 | 3t1e3 9192 | . . . . 5 ⊢ (3 · 1) = 3 | |
| 9 | 7, 8 | oveq12i 5956 | . . . 4 ⊢ ((3 · 2) + (3 · 1)) = (6 + 3) |
| 10 | 6, 9 | eqtri 2226 | . . 3 ⊢ (3 · (2 + 1)) = (6 + 3) |
| 11 | 6p3e9 9187 | . . 3 ⊢ (6 + 3) = 9 | |
| 12 | 10, 11 | eqtri 2226 | . 2 ⊢ (3 · (2 + 1)) = 9 |
| 13 | 2, 12 | eqtri 2226 | 1 ⊢ (3 · 3) = 9 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1373 (class class class)co 5944 1c1 7926 + caddc 7928 · cmul 7930 2c2 9087 3c3 9088 6c6 9091 9c9 9094 |
| 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 711 ax-5 1470 ax-7 1471 ax-gen 1472 ax-ie1 1516 ax-ie2 1517 ax-8 1527 ax-10 1528 ax-11 1529 ax-i12 1530 ax-bndl 1532 ax-4 1533 ax-17 1549 ax-i9 1553 ax-ial 1557 ax-i5r 1558 ax-ext 2187 ax-resscn 8017 ax-1cn 8018 ax-1re 8019 ax-icn 8020 ax-addcl 8021 ax-addrcl 8022 ax-mulcl 8023 ax-mulcom 8026 ax-addass 8027 ax-mulass 8028 ax-distr 8029 ax-1rid 8032 ax-cnre 8036 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-nf 1484 df-sb 1786 df-clab 2192 df-cleq 2198 df-clel 2201 df-nfc 2337 df-ral 2489 df-rex 2490 df-v 2774 df-un 3170 df-in 3172 df-ss 3179 df-sn 3639 df-pr 3640 df-op 3642 df-uni 3851 df-br 4045 df-iota 5232 df-fv 5279 df-ov 5947 df-2 9095 df-3 9096 df-4 9097 df-5 9098 df-6 9099 df-7 9100 df-8 9101 df-9 9102 |
| This theorem is referenced by: sq3 10781 3dvds 12175 3dvdsdec 12176 3dvds2dec 12177 lgsdir2lem5 15509 |
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