Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > ex-fac | GIF version |
Description: Example for df-fac 9653. (Contributed by AV, 4-Sep-2021.) |
Ref | Expression |
---|---|
ex-fac | ⊢ (!‘5) = ;;120 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-5 8101 | . . . 4 ⊢ 5 = (4 + 1) | |
2 | 1 | fveq2i 5201 | . . 3 ⊢ (!‘5) = (!‘(4 + 1)) |
3 | 4nn0 8307 | . . . 4 ⊢ 4 ∈ ℕ0 | |
4 | facp1 9657 | . . . 4 ⊢ (4 ∈ ℕ0 → (!‘(4 + 1)) = ((!‘4) · (4 + 1))) | |
5 | 3, 4 | ax-mp 7 | . . 3 ⊢ (!‘(4 + 1)) = ((!‘4) · (4 + 1)) |
6 | 2, 5 | eqtri 2101 | . 2 ⊢ (!‘5) = ((!‘4) · (4 + 1)) |
7 | fac4 9660 | . . . 4 ⊢ (!‘4) = ;24 | |
8 | 4p1e5 8168 | . . . 4 ⊢ (4 + 1) = 5 | |
9 | 7, 8 | oveq12i 5544 | . . 3 ⊢ ((!‘4) · (4 + 1)) = (;24 · 5) |
10 | 5nn0 8308 | . . . 4 ⊢ 5 ∈ ℕ0 | |
11 | 2nn0 8305 | . . . 4 ⊢ 2 ∈ ℕ0 | |
12 | eqid 2081 | . . . 4 ⊢ ;24 = ;24 | |
13 | 0nn0 8303 | . . . 4 ⊢ 0 ∈ ℕ0 | |
14 | 1nn0 8304 | . . . . 5 ⊢ 1 ∈ ℕ0 | |
15 | 5cn 8119 | . . . . . 6 ⊢ 5 ∈ ℂ | |
16 | 2cn 8110 | . . . . . 6 ⊢ 2 ∈ ℂ | |
17 | 5t2e10 8576 | . . . . . 6 ⊢ (5 · 2) = ;10 | |
18 | 15, 16, 17 | mulcomli 7126 | . . . . 5 ⊢ (2 · 5) = ;10 |
19 | 16 | addid2i 7251 | . . . . 5 ⊢ (0 + 2) = 2 |
20 | 14, 13, 11, 18, 19 | decaddi 8536 | . . . 4 ⊢ ((2 · 5) + 2) = ;12 |
21 | 4cn 8117 | . . . . 5 ⊢ 4 ∈ ℂ | |
22 | 5t4e20 8578 | . . . . 5 ⊢ (5 · 4) = ;20 | |
23 | 15, 21, 22 | mulcomli 7126 | . . . 4 ⊢ (4 · 5) = ;20 |
24 | 10, 11, 3, 12, 13, 11, 20, 23 | decmul1c 8541 | . . 3 ⊢ (;24 · 5) = ;;120 |
25 | 9, 24 | eqtri 2101 | . 2 ⊢ ((!‘4) · (4 + 1)) = ;;120 |
26 | 6, 25 | eqtri 2101 | 1 ⊢ (!‘5) = ;;120 |
Colors of variables: wff set class |
Syntax hints: = wceq 1284 ∈ wcel 1433 ‘cfv 4922 (class class class)co 5532 0cc0 6981 1c1 6982 + caddc 6984 · cmul 6986 2c2 8089 4c4 8091 5c5 8092 ℕ0cn0 8288 ;cdc 8477 !cfa 9652 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-ia1 104 ax-ia2 105 ax-ia3 106 ax-in1 576 ax-in2 577 ax-io 662 ax-5 1376 ax-7 1377 ax-gen 1378 ax-ie1 1422 ax-ie2 1423 ax-8 1435 ax-10 1436 ax-11 1437 ax-i12 1438 ax-bndl 1439 ax-4 1440 ax-13 1444 ax-14 1445 ax-17 1459 ax-i9 1463 ax-ial 1467 ax-i5r 1468 ax-ext 2063 ax-coll 3893 ax-sep 3896 ax-nul 3904 ax-pow 3948 ax-pr 3964 ax-un 4188 ax-setind 4280 ax-iinf 4329 ax-cnex 7067 ax-resscn 7068 ax-1cn 7069 ax-1re 7070 ax-icn 7071 ax-addcl 7072 ax-addrcl 7073 ax-mulcl 7074 ax-addcom 7076 ax-mulcom 7077 ax-addass 7078 ax-mulass 7079 ax-distr 7080 ax-i2m1 7081 ax-0lt1 7082 ax-1rid 7083 ax-0id 7084 ax-rnegex 7085 ax-cnre 7087 ax-pre-ltirr 7088 ax-pre-ltwlin 7089 ax-pre-lttrn 7090 ax-pre-ltadd 7092 |
This theorem depends on definitions: df-bi 115 df-3or 920 df-3an 921 df-tru 1287 df-fal 1290 df-nf 1390 df-sb 1686 df-eu 1944 df-mo 1945 df-clab 2068 df-cleq 2074 df-clel 2077 df-nfc 2208 df-ne 2246 df-nel 2340 df-ral 2353 df-rex 2354 df-reu 2355 df-rab 2357 df-v 2603 df-sbc 2816 df-csb 2909 df-dif 2975 df-un 2977 df-in 2979 df-ss 2986 df-nul 3252 df-pw 3384 df-sn 3404 df-pr 3405 df-op 3407 df-uni 3602 df-int 3637 df-iun 3680 df-br 3786 df-opab 3840 df-mpt 3841 df-tr 3876 df-id 4048 df-iord 4121 df-on 4123 df-suc 4126 df-iom 4332 df-xp 4369 df-rel 4370 df-cnv 4371 df-co 4372 df-dm 4373 df-rn 4374 df-res 4375 df-ima 4376 df-iota 4887 df-fun 4924 df-fn 4925 df-f 4926 df-f1 4927 df-fo 4928 df-f1o 4929 df-fv 4930 df-riota 5488 df-ov 5535 df-oprab 5536 df-mpt2 5537 df-1st 5787 df-2nd 5788 df-recs 5943 df-frec 6001 df-pnf 7155 df-mnf 7156 df-xr 7157 df-ltxr 7158 df-le 7159 df-sub 7281 df-neg 7282 df-inn 8040 df-2 8098 df-3 8099 df-4 8100 df-5 8101 df-6 8102 df-7 8103 df-8 8104 df-9 8105 df-n0 8289 df-z 8352 df-dec 8478 df-uz 8620 df-iseq 9432 df-fac 9653 |
This theorem is referenced by: (None) |
Copyright terms: Public domain | W3C validator |