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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 9390 | . . 3 ⊢ 7 ∈ ℝ | |
| 2 | 1re 8326 | . . 3 ⊢ 1 ∈ ℝ | |
| 3 | 7pos 9409 | . . 3 ⊢ 0 < 7 | |
| 4 | 0lt1 8455 | . . 3 ⊢ 0 < 1 | |
| 5 | 1, 2, 3, 4 | addgt0ii 8821 | . 2 ⊢ 0 < (7 + 1) |
| 6 | df-8 9372 | . 2 ⊢ 8 = (7 + 1) | |
| 7 | 5, 6 | breqtrri 4157 | 1 ⊢ 0 < 8 |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: class class class wbr 4130 (class class class)co 6085 0cc0 8180 1c1 8181 + caddc 8183 < clt 8361 7c7 9363 8c8 9364 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4249 ax-pow 4311 ax-pr 4346 ax-un 4578 ax-setind 4684 ax-cnex 8271 ax-resscn 8272 ax-1cn 8273 ax-1re 8274 ax-icn 8275 ax-addcl 8276 ax-addrcl 8277 ax-mulcl 8278 ax-addcom 8280 ax-addass 8282 ax-i2m1 8285 ax-0lt1 8286 ax-0id 8288 ax-rnegex 8289 ax-pre-lttrn 8294 ax-pre-ltadd 8296 |
| This proof depends on definitions: df-bi 117 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-nel 2516 df-ral 2533 df-rex 2534 df-rab 2537 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-pw 3690 df-sn 3715 df-pr 3716 df-op 3718 df-uni 3936 df-br 4131 df-opab 4193 df-xp 4780 df-iota 5337 df-fv 5385 df-ov 6088 df-pnf 8363 df-mnf 8364 df-ltxr 8366 df-2 9366 df-3 9367 df-4 9368 df-5 9369 df-6 9370 df-7 9371 df-8 9372 |
| This theorem is used by: 9pos 9411 8th4div3 9529 chtqub 16257 bposlem8 16279 bposlem9 16280 lgsdir2lem1 16313 lgsdir2lem4 16316 lgsdir2lem5 16317 2lgslem3a1 16382 2lgslem3b1 16383 2lgslem3c1 16384 2lgsoddprmlem1 16390 2lgsoddprmlem2 16391 2lgsoddprmlem3a 16392 2lgsoddprmlem3b 16393 2lgsoddprmlem3c 16394 2lgsoddprmlem3d 16395 |
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