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| Mirrors > Home > ILE Home > Th. List > 7pos | GIF version | ||
| Description: The number 7 is positive. (Contributed by NM, 27-May-1999.) |
| Ref | Expression |
|---|---|
| 7pos | ⊢ 0 < 7 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 6re 9132 | . . 3 ⊢ 6 ∈ ℝ | |
| 2 | 1re 8086 | . . 3 ⊢ 1 ∈ ℝ | |
| 3 | 6pos 9152 | . . 3 ⊢ 0 < 6 | |
| 4 | 0lt1 8214 | . . 3 ⊢ 0 < 1 | |
| 5 | 1, 2, 3, 4 | addgt0ii 8579 | . 2 ⊢ 0 < (6 + 1) |
| 6 | df-7 9115 | . 2 ⊢ 7 = (6 + 1) | |
| 7 | 5, 6 | breqtrri 4077 | 1 ⊢ 0 < 7 |
| Colors of variables: wff set class |
| Syntax hints: class class class wbr 4050 (class class class)co 5956 0cc0 7940 1c1 7941 + caddc 7943 < clt 8122 6c6 9106 7c7 9107 |
| 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 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2179 ax-14 2180 ax-ext 2188 ax-sep 4169 ax-pow 4225 ax-pr 4260 ax-un 4487 ax-setind 4592 ax-cnex 8031 ax-resscn 8032 ax-1cn 8033 ax-1re 8034 ax-icn 8035 ax-addcl 8036 ax-addrcl 8037 ax-mulcl 8038 ax-addcom 8040 ax-addass 8042 ax-i2m1 8045 ax-0lt1 8046 ax-0id 8048 ax-rnegex 8049 ax-pre-lttrn 8054 ax-pre-ltadd 8056 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-fal 1379 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ne 2378 df-nel 2473 df-ral 2490 df-rex 2491 df-rab 2494 df-v 2775 df-dif 3172 df-un 3174 df-in 3176 df-ss 3183 df-pw 3622 df-sn 3643 df-pr 3644 df-op 3646 df-uni 3856 df-br 4051 df-opab 4113 df-xp 4688 df-iota 5240 df-fv 5287 df-ov 5959 df-pnf 8124 df-mnf 8125 df-ltxr 8127 df-2 9110 df-3 9111 df-4 9112 df-5 9113 df-6 9114 df-7 9115 |
| This theorem is referenced by: 8pos 9154 lgsdir2lem1 15575 |
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