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Mirrors > Home > ILE Home > Th. List > neg1lt0 | GIF version |
Description: -1 is less than 0 (common case). (Contributed by David A. Wheeler, 8-Dec-2018.) |
Ref | Expression |
---|---|
neg1lt0 | ⊢ -1 < 0 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | neg0 8201 | . . 3 ⊢ -0 = 0 | |
2 | 0lt1 8082 | . . 3 ⊢ 0 < 1 | |
3 | 1, 2 | eqbrtri 4024 | . 2 ⊢ -0 < 1 |
4 | 1re 7955 | . . 3 ⊢ 1 ∈ ℝ | |
5 | 0re 7956 | . . 3 ⊢ 0 ∈ ℝ | |
6 | 4, 5 | ltnegcon1i 8454 | . 2 ⊢ (-1 < 0 ↔ -0 < 1) |
7 | 3, 6 | mpbir 146 | 1 ⊢ -1 < 0 |
Colors of variables: wff set class |
Syntax hints: class class class wbr 4003 0cc0 7810 1c1 7811 < clt 7990 -cneg 8127 |
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 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-sep 4121 ax-pow 4174 ax-pr 4209 ax-un 4433 ax-setind 4536 ax-cnex 7901 ax-resscn 7902 ax-1cn 7903 ax-1re 7904 ax-icn 7905 ax-addcl 7906 ax-addrcl 7907 ax-mulcl 7908 ax-addcom 7910 ax-addass 7912 ax-distr 7914 ax-i2m1 7915 ax-0lt1 7916 ax-0id 7918 ax-rnegex 7919 ax-cnre 7921 ax-pre-ltadd 7926 |
This theorem depends on definitions: df-bi 117 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-nel 2443 df-ral 2460 df-rex 2461 df-reu 2462 df-rab 2464 df-v 2739 df-sbc 2963 df-dif 3131 df-un 3133 df-in 3135 df-ss 3142 df-pw 3577 df-sn 3598 df-pr 3599 df-op 3601 df-uni 3810 df-br 4004 df-opab 4065 df-id 4293 df-xp 4632 df-rel 4633 df-cnv 4634 df-co 4635 df-dm 4636 df-iota 5178 df-fun 5218 df-fv 5224 df-riota 5830 df-ov 5877 df-oprab 5878 df-mpo 5879 df-pnf 7992 df-mnf 7993 df-ltxr 7995 df-sub 8128 df-neg 8129 |
This theorem is referenced by: lgsdir2lem3 14324 apdiff 14678 |
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