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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 9067 | . . 3 ⊢ 3 = (2 + 1) | |
| 2 | 1 | oveq2i 5936 | . 2 ⊢ (3 · 3) = (3 · (2 + 1)) |
| 3 | 3cn 9082 | . . . . 5 ⊢ 3 ∈ ℂ | |
| 4 | 2cn 9078 | . . . . 5 ⊢ 2 ∈ ℂ | |
| 5 | ax-1cn 7989 | . . . . 5 ⊢ 1 ∈ ℂ | |
| 6 | 3, 4, 5 | adddii 8053 | . . . 4 ⊢ (3 · (2 + 1)) = ((3 · 2) + (3 · 1)) |
| 7 | 3t2e6 9164 | . . . . 5 ⊢ (3 · 2) = 6 | |
| 8 | 3t1e3 9163 | . . . . 5 ⊢ (3 · 1) = 3 | |
| 9 | 7, 8 | oveq12i 5937 | . . . 4 ⊢ ((3 · 2) + (3 · 1)) = (6 + 3) |
| 10 | 6, 9 | eqtri 2217 | . . 3 ⊢ (3 · (2 + 1)) = (6 + 3) |
| 11 | 6p3e9 9158 | . . 3 ⊢ (6 + 3) = 9 | |
| 12 | 10, 11 | eqtri 2217 | . 2 ⊢ (3 · (2 + 1)) = 9 |
| 13 | 2, 12 | eqtri 2217 | 1 ⊢ (3 · 3) = 9 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1364 (class class class)co 5925 1c1 7897 + caddc 7899 · cmul 7901 2c2 9058 3c3 9059 6c6 9062 9c9 9065 |
| 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 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-ext 2178 ax-resscn 7988 ax-1cn 7989 ax-1re 7990 ax-icn 7991 ax-addcl 7992 ax-addrcl 7993 ax-mulcl 7994 ax-mulcom 7997 ax-addass 7998 ax-mulass 7999 ax-distr 8000 ax-1rid 8003 ax-cnre 8007 |
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-nf 1475 df-sb 1777 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ral 2480 df-rex 2481 df-v 2765 df-un 3161 df-in 3163 df-ss 3170 df-sn 3629 df-pr 3630 df-op 3632 df-uni 3841 df-br 4035 df-iota 5220 df-fv 5267 df-ov 5928 df-2 9066 df-3 9067 df-4 9068 df-5 9069 df-6 9070 df-7 9071 df-8 9072 df-9 9073 |
| This theorem is referenced by: sq3 10745 3dvds 12046 3dvdsdec 12047 3dvds2dec 12048 lgsdir2lem5 15357 |
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