Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
Mirrors > Home > ILE Home > Th. List > ex-fac | GIF version |
Description: Example for df-fac 10472. (Contributed by AV, 4-Sep-2021.) |
Ref | Expression |
---|---|
ex-fac | ⊢ (!‘5) = ;;120 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-5 8782 | . . . 4 ⊢ 5 = (4 + 1) | |
2 | 1 | fveq2i 5424 | . . 3 ⊢ (!‘5) = (!‘(4 + 1)) |
3 | 4nn0 8996 | . . . 4 ⊢ 4 ∈ ℕ0 | |
4 | facp1 10476 | . . . 4 ⊢ (4 ∈ ℕ0 → (!‘(4 + 1)) = ((!‘4) · (4 + 1))) | |
5 | 3, 4 | ax-mp 5 | . . 3 ⊢ (!‘(4 + 1)) = ((!‘4) · (4 + 1)) |
6 | 2, 5 | eqtri 2160 | . 2 ⊢ (!‘5) = ((!‘4) · (4 + 1)) |
7 | fac4 10479 | . . . 4 ⊢ (!‘4) = ;24 | |
8 | 4p1e5 8856 | . . . 4 ⊢ (4 + 1) = 5 | |
9 | 7, 8 | oveq12i 5786 | . . 3 ⊢ ((!‘4) · (4 + 1)) = (;24 · 5) |
10 | 5nn0 8997 | . . . 4 ⊢ 5 ∈ ℕ0 | |
11 | 2nn0 8994 | . . . 4 ⊢ 2 ∈ ℕ0 | |
12 | eqid 2139 | . . . 4 ⊢ ;24 = ;24 | |
13 | 0nn0 8992 | . . . 4 ⊢ 0 ∈ ℕ0 | |
14 | 1nn0 8993 | . . . . 5 ⊢ 1 ∈ ℕ0 | |
15 | 5cn 8800 | . . . . . 6 ⊢ 5 ∈ ℂ | |
16 | 2cn 8791 | . . . . . 6 ⊢ 2 ∈ ℂ | |
17 | 5t2e10 9281 | . . . . . 6 ⊢ (5 · 2) = ;10 | |
18 | 15, 16, 17 | mulcomli 7773 | . . . . 5 ⊢ (2 · 5) = ;10 |
19 | 16 | addid2i 7905 | . . . . 5 ⊢ (0 + 2) = 2 |
20 | 14, 13, 11, 18, 19 | decaddi 9241 | . . . 4 ⊢ ((2 · 5) + 2) = ;12 |
21 | 4cn 8798 | . . . . 5 ⊢ 4 ∈ ℂ | |
22 | 5t4e20 9283 | . . . . 5 ⊢ (5 · 4) = ;20 | |
23 | 15, 21, 22 | mulcomli 7773 | . . . 4 ⊢ (4 · 5) = ;20 |
24 | 10, 11, 3, 12, 13, 11, 20, 23 | decmul1c 9246 | . . 3 ⊢ (;24 · 5) = ;;120 |
25 | 9, 24 | eqtri 2160 | . 2 ⊢ ((!‘4) · (4 + 1)) = ;;120 |
26 | 6, 25 | eqtri 2160 | 1 ⊢ (!‘5) = ;;120 |
Colors of variables: wff set class |
Syntax hints: = wceq 1331 ∈ wcel 1480 ‘cfv 5123 (class class class)co 5774 0cc0 7620 1c1 7621 + caddc 7623 · cmul 7625 2c2 8771 4c4 8773 5c5 8774 ℕ0cn0 8977 ;cdc 9182 !cfa 10471 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 603 ax-in2 604 ax-io 698 ax-5 1423 ax-7 1424 ax-gen 1425 ax-ie1 1469 ax-ie2 1470 ax-8 1482 ax-10 1483 ax-11 1484 ax-i12 1485 ax-bndl 1486 ax-4 1487 ax-13 1491 ax-14 1492 ax-17 1506 ax-i9 1510 ax-ial 1514 ax-i5r 1515 ax-ext 2121 ax-coll 4043 ax-sep 4046 ax-nul 4054 ax-pow 4098 ax-pr 4131 ax-un 4355 ax-setind 4452 ax-iinf 4502 ax-cnex 7711 ax-resscn 7712 ax-1cn 7713 ax-1re 7714 ax-icn 7715 ax-addcl 7716 ax-addrcl 7717 ax-mulcl 7718 ax-addcom 7720 ax-mulcom 7721 ax-addass 7722 ax-mulass 7723 ax-distr 7724 ax-i2m1 7725 ax-0lt1 7726 ax-1rid 7727 ax-0id 7728 ax-rnegex 7729 ax-cnre 7731 ax-pre-ltirr 7732 ax-pre-ltwlin 7733 ax-pre-lttrn 7734 ax-pre-ltadd 7736 |
This theorem depends on definitions: df-bi 116 df-3or 963 df-3an 964 df-tru 1334 df-fal 1337 df-nf 1437 df-sb 1736 df-eu 2002 df-mo 2003 df-clab 2126 df-cleq 2132 df-clel 2135 df-nfc 2270 df-ne 2309 df-nel 2404 df-ral 2421 df-rex 2422 df-reu 2423 df-rab 2425 df-v 2688 df-sbc 2910 df-csb 3004 df-dif 3073 df-un 3075 df-in 3077 df-ss 3084 df-nul 3364 df-pw 3512 df-sn 3533 df-pr 3534 df-op 3536 df-uni 3737 df-int 3772 df-iun 3815 df-br 3930 df-opab 3990 df-mpt 3991 df-tr 4027 df-id 4215 df-iord 4288 df-on 4290 df-ilim 4291 df-suc 4293 df-iom 4505 df-xp 4545 df-rel 4546 df-cnv 4547 df-co 4548 df-dm 4549 df-rn 4550 df-res 4551 df-ima 4552 df-iota 5088 df-fun 5125 df-fn 5126 df-f 5127 df-f1 5128 df-fo 5129 df-f1o 5130 df-fv 5131 df-riota 5730 df-ov 5777 df-oprab 5778 df-mpo 5779 df-1st 6038 df-2nd 6039 df-recs 6202 df-frec 6288 df-pnf 7802 df-mnf 7803 df-xr 7804 df-ltxr 7805 df-le 7806 df-sub 7935 df-neg 7936 df-inn 8721 df-2 8779 df-3 8780 df-4 8781 df-5 8782 df-6 8783 df-7 8784 df-8 8785 df-9 8786 df-n0 8978 df-z 9055 df-dec 9183 df-uz 9327 df-seqfrec 10219 df-fac 10472 |
This theorem is referenced by: (None) |
Copyright terms: Public domain | W3C validator |