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| Mirrors > Home > MPE Home > Th. List > ltnlei | Structured version Visualization version GIF version | ||
| Description: 'Less than' in terms of 'less than or equal to'. (Contributed by NM, 11-Jul-2005.) |
| Ref | Expression |
|---|---|
| lt.1 | ⊢ 𝐴 ∈ ℝ |
| lt.2 | ⊢ 𝐵 ∈ ℝ |
| Ref | Expression |
|---|---|
| ltnlei | ⊢ (𝐴 < 𝐵 ↔ ¬ 𝐵 ≤ 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | lt.2 | . . 3 ⊢ 𝐵 ∈ ℝ | |
| 2 | lt.1 | . . 3 ⊢ 𝐴 ∈ ℝ | |
| 3 | 1, 2 | lenlti 11357 | . 2 ⊢ (𝐵 ≤ 𝐴 ↔ ¬ 𝐴 < 𝐵) |
| 4 | 3 | con2bii 360 | 1 ⊢ (𝐴 < 𝐵 ↔ ¬ 𝐵 ≤ 𝐴) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ¬ wn 3 ↔ wb 209 ∈ wcel 2145 class class class wbr 5103 ℝcr 11126 < clt 11270 ≤ cle 11271 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-ext 2732 ax-sep 5251 ax-pr 5398 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-sb 2100 df-clab 2739 df-cleq 2752 df-clel 2835 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-br 5104 df-opab 5168 df-xp 5661 df-cnv 5663 df-xr 11274 df-le 11276 |
| This theorem is used by: letrii 11362 nn0ge2m1nn 12601 0nelfz1 13600 fzpreddisj 13631 hashnn0n0nn 14458 hashge2el2dif 14548 hash3tpde 14561 divalglem5 16490 divalglem6 16491 sadcadd 16551 htpycc 25211 pco1 25246 pcohtpylem 25250 pcopt 25253 pcopt2 25254 pcoass 25255 pcorevlem 25257 vitalilem5 25843 vieta1lem2 26546 ppiltx 27416 ppiublem1 27441 chtub 27451 axlowdimlem16 29417 axlowdim 29421 lfgrnloop 29585 lfuhgr1v0e 29717 lfgrwlkprop 30152 ballotlem2 35003 subfacp1lem1 35761 subfacp1lem5 35766 bcneg1 36318 poimirlem9 38381 poimirlem16 38388 poimirlem17 38389 poimirlem19 38391 poimirlem20 38392 poimirlem22 38394 fdc 38498 pellexlem6 43678 jm2.23 43840 nprmdvdsfacm1lem2 48527 |
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