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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 9341 | . . 3 ⊢ 7 ∈ ℝ | |
| 2 | 1re 8290 | . . 3 ⊢ 1 ∈ ℝ | |
| 3 | 7pos 9360 | . . 3 ⊢ 0 < 7 | |
| 4 | 0lt1 8418 | . . 3 ⊢ 0 < 1 | |
| 5 | 1, 2, 3, 4 | addgt0ii 8784 | . 2 ⊢ 0 < (7 + 1) |
| 6 | df-8 9323 | . 2 ⊢ 8 = (7 + 1) | |
| 7 | 5, 6 | breqtrri 4142 | 1 ⊢ 0 < 8 |
| Colors of variables: wff set class |
| Syntax hints: class class class wbr 4115 (class class class)co 6059 0cc0 8144 1c1 8145 + caddc 8147 < clt 8325 7c7 9314 8c8 9315 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-13 2207 ax-14 2208 ax-ext 2216 ax-sep 4234 ax-pow 4293 ax-pr 4328 ax-un 4560 ax-setind 4665 ax-cnex 8235 ax-resscn 8236 ax-1cn 8237 ax-1re 8238 ax-icn 8239 ax-addcl 8240 ax-addrcl 8241 ax-mulcl 8242 ax-addcom 8244 ax-addass 8246 ax-i2m1 8249 ax-0lt1 8250 ax-0id 8252 ax-rnegex 8253 ax-pre-lttrn 8258 ax-pre-ltadd 8260 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2085 df-mo 2086 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-nel 2510 df-ral 2527 df-rex 2528 df-rab 2531 df-v 2817 df-dif 3216 df-un 3218 df-in 3220 df-ss 3227 df-pw 3677 df-sn 3701 df-pr 3702 df-op 3704 df-uni 3921 df-br 4116 df-opab 4178 df-xp 4761 df-iota 5318 df-fv 5366 df-ov 6062 df-pnf 8327 df-mnf 8328 df-ltxr 8330 df-2 9317 df-3 9318 df-4 9319 df-5 9320 df-6 9321 df-7 9322 df-8 9323 |
| This theorem is referenced by: 9pos 9362 8th4div3 9478 lgsdir2lem1 16032 lgsdir2lem4 16035 lgsdir2lem5 16036 2lgslem3a1 16101 2lgslem3b1 16102 2lgslem3c1 16103 2lgsoddprmlem1 16109 2lgsoddprmlem2 16110 2lgsoddprmlem3a 16111 2lgsoddprmlem3b 16112 2lgsoddprmlem3c 16113 2lgsoddprmlem3d 16114 |
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