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Mirrors > Home > ILE Home > Th. List > 9t9e81 | Unicode version |
Description: 9 times 9 equals 81. (Contributed by Mario Carneiro, 19-Apr-2015.) |
Ref | Expression |
---|---|
9t9e81 | ; |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 9nn0 9129 | . 2 | |
2 | 8nn0 9128 | . 2 | |
3 | df-9 8914 | . 2 | |
4 | 9t8e72 9440 | . 2 ; | |
5 | 7nn0 9127 | . . 3 | |
6 | 2nn0 9122 | . . 3 | |
7 | eqid 2164 | . . 3 ; ; | |
8 | 7p1e8 8987 | . . 3 | |
9 | 1nn0 9121 | . . 3 | |
10 | 9cn 8936 | . . . 4 | |
11 | 2cn 8919 | . . . 4 | |
12 | 9p2e11 9399 | . . . 4 ; | |
13 | 10, 11, 12 | addcomli 8034 | . . 3 ; |
14 | 5, 6, 1, 7, 8, 9, 13 | decaddci 9373 | . 2 ; ; |
15 | 1, 2, 3, 4, 14 | 4t3lem 9409 | 1 ; |
Colors of variables: wff set class |
Syntax hints: wceq 1342 (class class class)co 5836 c1 7745 cmul 7749 c2 8899 c7 8904 c8 8905 c9 8906 ;cdc 9313 |
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 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-14 2138 ax-ext 2146 ax-sep 4094 ax-pow 4147 ax-pr 4181 ax-setind 4508 ax-cnex 7835 ax-resscn 7836 ax-1cn 7837 ax-1re 7838 ax-icn 7839 ax-addcl 7840 ax-addrcl 7841 ax-mulcl 7842 ax-addcom 7844 ax-mulcom 7845 ax-addass 7846 ax-mulass 7847 ax-distr 7848 ax-i2m1 7849 ax-1rid 7851 ax-0id 7852 ax-rnegex 7853 ax-cnre 7855 |
This theorem depends on definitions: df-bi 116 df-3an 969 df-tru 1345 df-fal 1348 df-nf 1448 df-sb 1750 df-eu 2016 df-mo 2017 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-ne 2335 df-ral 2447 df-rex 2448 df-reu 2449 df-rab 2451 df-v 2723 df-sbc 2947 df-dif 3113 df-un 3115 df-in 3117 df-ss 3124 df-pw 3555 df-sn 3576 df-pr 3577 df-op 3579 df-uni 3784 df-int 3819 df-br 3977 df-opab 4038 df-id 4265 df-xp 4604 df-rel 4605 df-cnv 4606 df-co 4607 df-dm 4608 df-iota 5147 df-fun 5184 df-fv 5190 df-riota 5792 df-ov 5839 df-oprab 5840 df-mpo 5841 df-sub 8062 df-inn 8849 df-2 8907 df-3 8908 df-4 8909 df-5 8910 df-6 8911 df-7 8912 df-8 8913 df-9 8914 df-n0 9106 df-dec 9314 |
This theorem is referenced by: (None) |
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