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Mirrors > Home > MPE Home > Th. List > fac4 | Structured version Visualization version GIF version |
Description: The factorial of 4. (Contributed by Mario Carneiro, 18-Jun-2015.) |
Ref | Expression |
---|---|
fac4 | ⊢ (!‘4) = ;24 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 3nn0 11916 | . . 3 ⊢ 3 ∈ ℕ0 | |
2 | facp1 13639 | . . 3 ⊢ (3 ∈ ℕ0 → (!‘(3 + 1)) = ((!‘3) · (3 + 1))) | |
3 | 1, 2 | ax-mp 5 | . 2 ⊢ (!‘(3 + 1)) = ((!‘3) · (3 + 1)) |
4 | 3p1e4 11783 | . . 3 ⊢ (3 + 1) = 4 | |
5 | 4 | fveq2i 6673 | . 2 ⊢ (!‘(3 + 1)) = (!‘4) |
6 | fac3 13641 | . . . 4 ⊢ (!‘3) = 6 | |
7 | 6, 4 | oveq12i 7168 | . . 3 ⊢ ((!‘3) · (3 + 1)) = (6 · 4) |
8 | 6t4e24 12205 | . . 3 ⊢ (6 · 4) = ;24 | |
9 | 7, 8 | eqtri 2844 | . 2 ⊢ ((!‘3) · (3 + 1)) = ;24 |
10 | 3, 5, 9 | 3eqtr3i 2852 | 1 ⊢ (!‘4) = ;24 |
Colors of variables: wff setvar class |
Syntax hints: = wceq 1537 ∈ wcel 2114 ‘cfv 6355 (class class class)co 7156 1c1 10538 + caddc 10540 · cmul 10542 2c2 11693 3c3 11694 4c4 11695 6c6 11697 ℕ0cn0 11898 ;cdc 12099 !cfa 13634 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 ax-cnex 10593 ax-resscn 10594 ax-1cn 10595 ax-icn 10596 ax-addcl 10597 ax-addrcl 10598 ax-mulcl 10599 ax-mulrcl 10600 ax-mulcom 10601 ax-addass 10602 ax-mulass 10603 ax-distr 10604 ax-i2m1 10605 ax-1ne0 10606 ax-1rid 10607 ax-rnegex 10608 ax-rrecex 10609 ax-cnre 10610 ax-pre-lttri 10611 ax-pre-lttrn 10612 ax-pre-ltadd 10613 ax-pre-mulgt0 10614 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3or 1084 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-reu 3145 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-pss 3954 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-tp 4572 df-op 4574 df-uni 4839 df-iun 4921 df-br 5067 df-opab 5129 df-mpt 5147 df-tr 5173 df-id 5460 df-eprel 5465 df-po 5474 df-so 5475 df-fr 5514 df-we 5516 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-pred 6148 df-ord 6194 df-on 6195 df-lim 6196 df-suc 6197 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-riota 7114 df-ov 7159 df-oprab 7160 df-mpo 7161 df-om 7581 df-2nd 7690 df-wrecs 7947 df-recs 8008 df-rdg 8046 df-er 8289 df-en 8510 df-dom 8511 df-sdom 8512 df-pnf 10677 df-mnf 10678 df-xr 10679 df-ltxr 10680 df-le 10681 df-sub 10872 df-neg 10873 df-nn 11639 df-2 11701 df-3 11702 df-4 11703 df-5 11704 df-6 11705 df-7 11706 df-8 11707 df-9 11708 df-n0 11899 df-z 11983 df-dec 12100 df-uz 12245 df-seq 13371 df-fac 13635 |
This theorem is referenced by: 2expltfac 16426 ex-fac 28230 |
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