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| Mirrors > Home > ILE Home > Th. List > 7t4e28 | GIF version | ||
| Description: 7 times 4 equals 28. (Contributed by Mario Carneiro, 19-Apr-2015.) |
| Ref | Expression |
|---|---|
| 7t4e28 | ⊢ (7 · 4) = ;28 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 7nn0 9568 | . 2 ⊢ 7 ∈ ℕ0 | |
| 2 | 3nn0 9564 | . 2 ⊢ 3 ∈ ℕ0 | |
| 3 | df-4 9348 | . 2 ⊢ 4 = (3 + 1) | |
| 4 | 7t3e21 9869 | . 2 ⊢ (7 · 3) = ;21 | |
| 5 | 2nn0 9563 | . . 3 ⊢ 2 ∈ ℕ0 | |
| 6 | 1nn0 9562 | . . 3 ⊢ 1 ∈ ℕ0 | |
| 7 | eqid 2238 | . . 3 ⊢ ;21 = ;21 | |
| 8 | 7cn 9371 | . . . 4 ⊢ 7 ∈ ℂ | |
| 9 | ax-1cn 8266 | . . . 4 ⊢ 1 ∈ ℂ | |
| 10 | 7p1e8 9427 | . . . 4 ⊢ (7 + 1) = 8 | |
| 11 | 8, 9, 10 | addcomli 8465 | . . 3 ⊢ (1 + 7) = 8 |
| 12 | 5, 6, 1, 7, 11 | decaddi 9819 | . 2 ⊢ (;21 + 7) = ;28 |
| 13 | 1, 2, 3, 4, 12 | 4t3lem 9856 | 1 ⊢ (7 · 4) = ;28 |
| Colors of variables: wff set class |
| Syntax hints: = wceq 1402 (class class class)co 6079 1c1 8174 · cmul 8178 2c2 9338 3c3 9339 4c4 9340 7c7 9343 8c8 9344 ;cdc 9760 |
| 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 623 ax-in2 624 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-14 2212 ax-ext 2220 ax-sep 4247 ax-pow 4309 ax-pr 4344 ax-setind 4682 ax-cnex 8264 ax-resscn 8265 ax-1cn 8266 ax-1re 8267 ax-icn 8268 ax-addcl 8269 ax-addrcl 8270 ax-mulcl 8271 ax-addcom 8273 ax-mulcom 8274 ax-addass 8275 ax-mulass 8276 ax-distr 8277 ax-i2m1 8278 ax-1rid 8280 ax-0id 8281 ax-rnegex 8282 ax-cnre 8284 |
| This theorem depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3714 df-pr 3715 df-op 3717 df-uni 3934 df-int 3969 df-br 4129 df-opab 4191 df-id 4436 df-xp 4778 df-rel 4779 df-cnv 4780 df-co 4781 df-dm 4782 df-iota 5335 df-fun 5377 df-fv 5383 df-riota 6032 df-ov 6082 df-oprab 6083 df-mpo 6084 df-sub 8493 df-inn 9288 df-2 9346 df-3 9347 df-4 9348 df-5 9349 df-6 9350 df-7 9351 df-8 9352 df-9 9353 df-n0 9547 df-dec 9761 |
| This theorem is referenced by: 7t5e35 9871 |
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