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| Mirrors > Home > ILE Home > Th. List > 7t7e49 | GIF version | ||
| Description: 7 times 7 equals 49. (Contributed by Mario Carneiro, 19-Apr-2015.) |
| Ref | Expression |
|---|---|
| 7t7e49 | ⊢ (7 · 7) = ;49 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 7nn0 9483 | . 2 ⊢ 7 ∈ ℕ0 | |
| 2 | 6nn0 9482 | . 2 ⊢ 6 ∈ ℕ0 | |
| 3 | df-7 9266 | . 2 ⊢ 7 = (6 + 1) | |
| 4 | 7t6e42 9784 | . 2 ⊢ (7 · 6) = ;42 | |
| 5 | 4nn0 9480 | . . 3 ⊢ 4 ∈ ℕ0 | |
| 6 | 2nn0 9478 | . . 3 ⊢ 2 ∈ ℕ0 | |
| 7 | eqid 2231 | . . 3 ⊢ ;42 = ;42 | |
| 8 | 7cn 9286 | . . . 4 ⊢ 7 ∈ ℂ | |
| 9 | 2cn 9273 | . . . 4 ⊢ 2 ∈ ℂ | |
| 10 | 7p2e9 9354 | . . . 4 ⊢ (7 + 2) = 9 | |
| 11 | 8, 9, 10 | addcomli 8383 | . . 3 ⊢ (2 + 7) = 9 |
| 12 | 5, 6, 1, 7, 11 | decaddi 9731 | . 2 ⊢ (;42 + 7) = ;49 |
| 13 | 1, 2, 3, 4, 12 | 4t3lem 9768 | 1 ⊢ (7 · 7) = ;49 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1398 (class class class)co 6028 · cmul 8097 2c2 9253 4c4 9255 6c6 9257 7c7 9258 9c9 9260 ;cdc 9672 |
| 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-in1 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-14 2205 ax-ext 2213 ax-sep 4212 ax-pow 4270 ax-pr 4305 ax-setind 4641 ax-cnex 8183 ax-resscn 8184 ax-1cn 8185 ax-1re 8186 ax-icn 8187 ax-addcl 8188 ax-addrcl 8189 ax-mulcl 8190 ax-addcom 8192 ax-mulcom 8193 ax-addass 8194 ax-mulass 8195 ax-distr 8196 ax-i2m1 8197 ax-1rid 8199 ax-0id 8200 ax-rnegex 8201 ax-cnre 8203 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1811 df-eu 2082 df-mo 2083 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-ne 2404 df-ral 2516 df-rex 2517 df-reu 2518 df-rab 2520 df-v 2805 df-sbc 3033 df-dif 3203 df-un 3205 df-in 3207 df-ss 3214 df-pw 3658 df-sn 3679 df-pr 3680 df-op 3682 df-uni 3899 df-int 3934 df-br 4094 df-opab 4156 df-id 4396 df-xp 4737 df-rel 4738 df-cnv 4739 df-co 4740 df-dm 4741 df-iota 5293 df-fun 5335 df-fv 5341 df-riota 5981 df-ov 6031 df-oprab 6032 df-mpo 6033 df-sub 8411 df-inn 9203 df-2 9261 df-3 9262 df-4 9263 df-5 9264 df-6 9265 df-7 9266 df-8 9267 df-9 9268 df-n0 9462 df-dec 9673 |
| This theorem is referenced by: (None) |
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