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Mirrors > Home > ILE Home > Th. List > ex-fac | GIF version |
Description: Example for df-fac 10504. (Contributed by AV, 4-Sep-2021.) |
Ref | Expression |
---|---|
ex-fac | ⊢ (!‘5) = ;;120 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-5 8806 | . . . 4 ⊢ 5 = (4 + 1) | |
2 | 1 | fveq2i 5432 | . . 3 ⊢ (!‘5) = (!‘(4 + 1)) |
3 | 4nn0 9020 | . . . 4 ⊢ 4 ∈ ℕ0 | |
4 | facp1 10508 | . . . 4 ⊢ (4 ∈ ℕ0 → (!‘(4 + 1)) = ((!‘4) · (4 + 1))) | |
5 | 3, 4 | ax-mp 5 | . . 3 ⊢ (!‘(4 + 1)) = ((!‘4) · (4 + 1)) |
6 | 2, 5 | eqtri 2161 | . 2 ⊢ (!‘5) = ((!‘4) · (4 + 1)) |
7 | fac4 10511 | . . . 4 ⊢ (!‘4) = ;24 | |
8 | 4p1e5 8880 | . . . 4 ⊢ (4 + 1) = 5 | |
9 | 7, 8 | oveq12i 5794 | . . 3 ⊢ ((!‘4) · (4 + 1)) = (;24 · 5) |
10 | 5nn0 9021 | . . . 4 ⊢ 5 ∈ ℕ0 | |
11 | 2nn0 9018 | . . . 4 ⊢ 2 ∈ ℕ0 | |
12 | eqid 2140 | . . . 4 ⊢ ;24 = ;24 | |
13 | 0nn0 9016 | . . . 4 ⊢ 0 ∈ ℕ0 | |
14 | 1nn0 9017 | . . . . 5 ⊢ 1 ∈ ℕ0 | |
15 | 5cn 8824 | . . . . . 6 ⊢ 5 ∈ ℂ | |
16 | 2cn 8815 | . . . . . 6 ⊢ 2 ∈ ℂ | |
17 | 5t2e10 9305 | . . . . . 6 ⊢ (5 · 2) = ;10 | |
18 | 15, 16, 17 | mulcomli 7797 | . . . . 5 ⊢ (2 · 5) = ;10 |
19 | 16 | addid2i 7929 | . . . . 5 ⊢ (0 + 2) = 2 |
20 | 14, 13, 11, 18, 19 | decaddi 9265 | . . . 4 ⊢ ((2 · 5) + 2) = ;12 |
21 | 4cn 8822 | . . . . 5 ⊢ 4 ∈ ℂ | |
22 | 5t4e20 9307 | . . . . 5 ⊢ (5 · 4) = ;20 | |
23 | 15, 21, 22 | mulcomli 7797 | . . . 4 ⊢ (4 · 5) = ;20 |
24 | 10, 11, 3, 12, 13, 11, 20, 23 | decmul1c 9270 | . . 3 ⊢ (;24 · 5) = ;;120 |
25 | 9, 24 | eqtri 2161 | . 2 ⊢ ((!‘4) · (4 + 1)) = ;;120 |
26 | 6, 25 | eqtri 2161 | 1 ⊢ (!‘5) = ;;120 |
Colors of variables: wff set class |
Syntax hints: = wceq 1332 ∈ wcel 1481 ‘cfv 5131 (class class class)co 5782 0cc0 7644 1c1 7645 + caddc 7647 · cmul 7649 2c2 8795 4c4 8797 5c5 8798 ℕ0cn0 9001 ;cdc 9206 !cfa 10503 |
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 604 ax-in2 605 ax-io 699 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-10 1484 ax-11 1485 ax-i12 1486 ax-bndl 1487 ax-4 1488 ax-13 1492 ax-14 1493 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 ax-coll 4051 ax-sep 4054 ax-nul 4062 ax-pow 4106 ax-pr 4139 ax-un 4363 ax-setind 4460 ax-iinf 4510 ax-cnex 7735 ax-resscn 7736 ax-1cn 7737 ax-1re 7738 ax-icn 7739 ax-addcl 7740 ax-addrcl 7741 ax-mulcl 7742 ax-addcom 7744 ax-mulcom 7745 ax-addass 7746 ax-mulass 7747 ax-distr 7748 ax-i2m1 7749 ax-0lt1 7750 ax-1rid 7751 ax-0id 7752 ax-rnegex 7753 ax-cnre 7755 ax-pre-ltirr 7756 ax-pre-ltwlin 7757 ax-pre-lttrn 7758 ax-pre-ltadd 7760 |
This theorem depends on definitions: df-bi 116 df-3or 964 df-3an 965 df-tru 1335 df-fal 1338 df-nf 1438 df-sb 1737 df-eu 2003 df-mo 2004 df-clab 2127 df-cleq 2133 df-clel 2136 df-nfc 2271 df-ne 2310 df-nel 2405 df-ral 2422 df-rex 2423 df-reu 2424 df-rab 2426 df-v 2691 df-sbc 2914 df-csb 3008 df-dif 3078 df-un 3080 df-in 3082 df-ss 3089 df-nul 3369 df-pw 3517 df-sn 3538 df-pr 3539 df-op 3541 df-uni 3745 df-int 3780 df-iun 3823 df-br 3938 df-opab 3998 df-mpt 3999 df-tr 4035 df-id 4223 df-iord 4296 df-on 4298 df-ilim 4299 df-suc 4301 df-iom 4513 df-xp 4553 df-rel 4554 df-cnv 4555 df-co 4556 df-dm 4557 df-rn 4558 df-res 4559 df-ima 4560 df-iota 5096 df-fun 5133 df-fn 5134 df-f 5135 df-f1 5136 df-fo 5137 df-f1o 5138 df-fv 5139 df-riota 5738 df-ov 5785 df-oprab 5786 df-mpo 5787 df-1st 6046 df-2nd 6047 df-recs 6210 df-frec 6296 df-pnf 7826 df-mnf 7827 df-xr 7828 df-ltxr 7829 df-le 7830 df-sub 7959 df-neg 7960 df-inn 8745 df-2 8803 df-3 8804 df-4 8805 df-5 8806 df-6 8807 df-7 8808 df-8 8809 df-9 8810 df-n0 9002 df-z 9079 df-dec 9207 df-uz 9351 df-seqfrec 10250 df-fac 10504 |
This theorem is referenced by: (None) |
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