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Mirrors > Home > ILE Home > Th. List > facnn | Unicode version |
Description: Value of the factorial function for positive integers. (Contributed by NM, 2-Dec-2004.) (Revised by Mario Carneiro, 13-Jul-2013.) |
Ref | Expression |
---|---|
facnn |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | c0ex 7113 | . . 3 | |
2 | 1ex 7114 | . . 3 | |
3 | df-fac 9653 | . . . 4 | |
4 | nnuz 8654 | . . . . . . . 8 | |
5 | dfn2 8301 | . . . . . . . 8 | |
6 | 4, 5 | eqtr3i 2103 | . . . . . . 7 |
7 | 6 | reseq2i 4627 | . . . . . 6 |
8 | 1zzd 8378 | . . . . . . . . 9 | |
9 | cnex 7097 | . . . . . . . . . 10 | |
10 | 9 | a1i 9 | . . . . . . . . 9 |
11 | fvi 5251 | . . . . . . . . . . . . 13 | |
12 | 11 | eleq1d 2147 | . . . . . . . . . . . 12 |
13 | 12 | ibir 175 | . . . . . . . . . . 11 |
14 | eluzelcn 8630 | . . . . . . . . . . 11 | |
15 | 13, 14 | syl 14 | . . . . . . . . . 10 |
16 | 15 | adantl 271 | . . . . . . . . 9 |
17 | mulcl 7100 | . . . . . . . . . 10 | |
18 | 17 | adantl 271 | . . . . . . . . 9 |
19 | 8, 10, 16, 18 | iseqfn 9441 | . . . . . . . 8 |
20 | 19 | trud 1293 | . . . . . . 7 |
21 | fnresdm 5028 | . . . . . . 7 | |
22 | 20, 21 | ax-mp 7 | . . . . . 6 |
23 | 7, 22 | eqtr3i 2103 | . . . . 5 |
24 | 23 | uneq2i 3123 | . . . 4 |
25 | 3, 24 | eqtr4i 2104 | . . 3 |
26 | 1, 2, 25 | fvsnun2 5382 | . 2 |
27 | 26, 5 | eleq2s 2173 | 1 |
Colors of variables: wff set class |
Syntax hints: wi 4 wa 102 wceq 1284 wtru 1285 wcel 1433 cvv 2601 cdif 2970 cun 2971 csn 3398 cop 3401 cid 4043 cres 4365 wfn 4917 cfv 4922 (class class class)co 5532 cc 6979 cc0 6981 c1 6982 cmul 6986 cn 8039 cn0 8288 cuz 8619 cseq 9431 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-addass 7078 ax-distr 7080 ax-i2m1 7081 ax-0lt1 7082 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-n0 8289 df-z 8352 df-uz 8620 df-iseq 9432 df-fac 9653 |
This theorem is referenced by: fac1 9656 facp1 9657 ibcval5 9690 |
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