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| Mirrors > Home > MPE Home > Th. List > 7t4e28 | Structured version Visualization version 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 12529 | . 2 ⊢ 7 ∈ ℕ0 | |
| 2 | 3nn0 12525 | . 2 ⊢ 3 ∈ ℕ0 | |
| 3 | df-4 12308 | . 2 ⊢ 4 = (3 + 1) | |
| 4 | 7t3e21 12829 | . 2 ⊢ (7 · 3) = ;21 | |
| 5 | 2nn0 12524 | . . 3 ⊢ 2 ∈ ℕ0 | |
| 6 | 1nn0 12523 | . . 3 ⊢ 1 ∈ ℕ0 | |
| 7 | eqid 2770 | . . 3 ⊢ ;21 = ;21 | |
| 8 | 7cn 12338 | . . . 4 ⊢ 7 ∈ ℂ | |
| 9 | ax-1cn 11161 | . . . 4 ⊢ 1 ∈ ℂ | |
| 10 | 7p1e8 12392 | . . . 4 ⊢ (7 + 1) = 8 | |
| 11 | 8, 9, 10 | addcomli 11405 | . . 3 ⊢ (1 + 7) = 8 |
| 12 | 5, 6, 1, 7, 11 | decaddi 12779 | . 2 ⊢ (;21 + 7) = ;28 |
| 13 | 1, 2, 3, 4, 12 | 4t3lem 12816 | 1 ⊢ (7 · 4) = ;28 |
| Colors of variables: wff setvar class |
| Syntax hints: = wceq 1568 (class class class)co 7414 1c1 11104 · cmul 11108 2c2 12298 3c3 12299 4c4 12300 7c7 12303 8c8 12304 ;cdc 12714 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1823 ax-4 1837 ax-5 1938 ax-6 1995 ax-7 2036 ax-8 2152 ax-9 2160 ax-10 2183 ax-11 2199 ax-12 2220 ax-ext 2742 ax-sep 5262 ax-nul 5274 ax-pow 5340 ax-pr 5408 ax-un 7736 ax-resscn 11160 ax-1cn 11161 ax-icn 11162 ax-addcl 11163 ax-addrcl 11164 ax-mulcl 11165 ax-mulrcl 11166 ax-mulcom 11167 ax-addass 11168 ax-mulass 11169 ax-distr 11170 ax-i2m1 11171 ax-1ne0 11172 ax-1rid 11173 ax-rnegex 11174 ax-rrecex 11175 ax-cnre 11176 ax-pre-lttri 11177 ax-pre-lttrn 11178 ax-pre-ltadd 11179 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1571 df-fal 1581 df-ex 1808 df-nf 1812 df-sb 2099 df-mo 2574 df-eu 2604 df-clab 2749 df-cleq 2762 df-clel 2845 df-nfc 2919 df-ne 2966 df-nel 3072 df-ral 3087 df-rex 3097 df-reu 3377 df-rab 3424 df-v 3464 df-sbc 3753 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4878 df-iun 4963 df-br 5115 df-opab 5179 df-mpt 5198 df-tr 5224 df-id 5560 df-eprel 5565 df-po 5573 df-so 5574 df-fr 5618 df-we 5620 df-xp 5671 df-rel 5672 df-cnv 5673 df-co 5674 df-dm 5675 df-rn 5676 df-res 5677 df-ima 5678 df-pred 6306 df-ord 6367 df-on 6368 df-lim 6369 df-suc 6370 df-iota 6496 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7371 df-ov 7417 df-oprab 7418 df-mpo 7419 df-om 7866 df-2nd 7990 df-frecs 8281 df-wrecs 8312 df-recs 8361 df-rdg 8400 df-er 8697 df-en 8947 df-dom 8948 df-sdom 8949 df-pnf 11248 df-mnf 11249 df-ltxr 11251 df-sub 11446 df-nn 12237 df-2 12306 df-3 12307 df-4 12308 df-5 12309 df-6 12310 df-7 12311 df-8 12312 df-9 12313 df-n0 12508 df-dec 12715 |
| This theorem is referenced by: 7t5e35 12831 83prm 17186 317prm 17189 1259prm 17199 hgt750lem2 35009 3lexlogpow5ineq1 42771 fmtno5faclem1 48280 |
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