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| Mirrors > Home > ILE Home > Th. List > 8pos | GIF version | ||
| Description: The number 8 is positive. (Contributed by NM, 27-May-1999.) |
| Ref | Expression |
|---|---|
| 8pos | ⊢ 0 < 8 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 7re 9101 | . . 3 ⊢ 7 ∈ ℝ | |
| 2 | 1re 8053 | . . 3 ⊢ 1 ∈ ℝ | |
| 3 | 7pos 9120 | . . 3 ⊢ 0 < 7 | |
| 4 | 0lt1 8181 | . . 3 ⊢ 0 < 1 | |
| 5 | 1, 2, 3, 4 | addgt0ii 8546 | . 2 ⊢ 0 < (7 + 1) |
| 6 | df-8 9083 | . 2 ⊢ 8 = (7 + 1) | |
| 7 | 5, 6 | breqtrri 4070 | 1 ⊢ 0 < 8 |
| Colors of variables: wff set class |
| Syntax hints: class class class wbr 4043 (class class class)co 5934 0cc0 7907 1c1 7908 + caddc 7910 < clt 8089 7c7 9074 8c8 9075 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 710 ax-5 1469 ax-7 1470 ax-gen 1471 ax-ie1 1515 ax-ie2 1516 ax-8 1526 ax-10 1527 ax-11 1528 ax-i12 1529 ax-bndl 1531 ax-4 1532 ax-17 1548 ax-i9 1552 ax-ial 1556 ax-i5r 1557 ax-13 2177 ax-14 2178 ax-ext 2186 ax-sep 4161 ax-pow 4217 ax-pr 4252 ax-un 4478 ax-setind 4583 ax-cnex 7998 ax-resscn 7999 ax-1cn 8000 ax-1re 8001 ax-icn 8002 ax-addcl 8003 ax-addrcl 8004 ax-mulcl 8005 ax-addcom 8007 ax-addass 8009 ax-i2m1 8012 ax-0lt1 8013 ax-0id 8015 ax-rnegex 8016 ax-pre-lttrn 8021 ax-pre-ltadd 8023 |
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1375 df-fal 1378 df-nf 1483 df-sb 1785 df-eu 2056 df-mo 2057 df-clab 2191 df-cleq 2197 df-clel 2200 df-nfc 2336 df-ne 2376 df-nel 2471 df-ral 2488 df-rex 2489 df-rab 2492 df-v 2773 df-dif 3167 df-un 3169 df-in 3171 df-ss 3178 df-pw 3617 df-sn 3638 df-pr 3639 df-op 3641 df-uni 3850 df-br 4044 df-opab 4105 df-xp 4679 df-iota 5229 df-fv 5276 df-ov 5937 df-pnf 8091 df-mnf 8092 df-ltxr 8094 df-2 9077 df-3 9078 df-4 9079 df-5 9080 df-6 9081 df-7 9082 df-8 9083 |
| This theorem is referenced by: 9pos 9122 8th4div3 9238 lgsdir2lem1 15423 lgsdir2lem4 15426 lgsdir2lem5 15427 2lgslem3a1 15492 2lgslem3b1 15493 2lgslem3c1 15494 2lgsoddprmlem1 15500 2lgsoddprmlem2 15501 2lgsoddprmlem3a 15502 2lgsoddprmlem3b 15503 2lgsoddprmlem3c 15504 2lgsoddprmlem3d 15505 |
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