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Mirrors > Home > ILE Home > Th. List > lttri3 | GIF version |
Description: Tightness of real apartness. (Contributed by NM, 5-May-1999.) |
Ref | Expression |
---|---|
lttri3 | ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 = 𝐵 ↔ (¬ 𝐴 < 𝐵 ∧ ¬ 𝐵 < 𝐴))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ltnr 7975 | . . . . 5 ⊢ (𝐴 ∈ ℝ → ¬ 𝐴 < 𝐴) | |
2 | breq2 3986 | . . . . . 6 ⊢ (𝐴 = 𝐵 → (𝐴 < 𝐴 ↔ 𝐴 < 𝐵)) | |
3 | 2 | notbid 657 | . . . . 5 ⊢ (𝐴 = 𝐵 → (¬ 𝐴 < 𝐴 ↔ ¬ 𝐴 < 𝐵)) |
4 | 1, 3 | syl5ibcom 154 | . . . 4 ⊢ (𝐴 ∈ ℝ → (𝐴 = 𝐵 → ¬ 𝐴 < 𝐵)) |
5 | breq1 3985 | . . . . . 6 ⊢ (𝐴 = 𝐵 → (𝐴 < 𝐴 ↔ 𝐵 < 𝐴)) | |
6 | 5 | notbid 657 | . . . . 5 ⊢ (𝐴 = 𝐵 → (¬ 𝐴 < 𝐴 ↔ ¬ 𝐵 < 𝐴)) |
7 | 1, 6 | syl5ibcom 154 | . . . 4 ⊢ (𝐴 ∈ ℝ → (𝐴 = 𝐵 → ¬ 𝐵 < 𝐴)) |
8 | 4, 7 | jcad 305 | . . 3 ⊢ (𝐴 ∈ ℝ → (𝐴 = 𝐵 → (¬ 𝐴 < 𝐵 ∧ ¬ 𝐵 < 𝐴))) |
9 | 8 | adantr 274 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 = 𝐵 → (¬ 𝐴 < 𝐵 ∧ ¬ 𝐵 < 𝐴))) |
10 | ioran 742 | . . 3 ⊢ (¬ (𝐴 < 𝐵 ∨ 𝐵 < 𝐴) ↔ (¬ 𝐴 < 𝐵 ∧ ¬ 𝐵 < 𝐴)) | |
11 | axapti 7969 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ ¬ (𝐴 < 𝐵 ∨ 𝐵 < 𝐴)) → 𝐴 = 𝐵) | |
12 | 11 | 3expia 1195 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (¬ (𝐴 < 𝐵 ∨ 𝐵 < 𝐴) → 𝐴 = 𝐵)) |
13 | 10, 12 | syl5bir 152 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ((¬ 𝐴 < 𝐵 ∧ ¬ 𝐵 < 𝐴) → 𝐴 = 𝐵)) |
14 | 9, 13 | impbid 128 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 = 𝐵 ↔ (¬ 𝐴 < 𝐵 ∧ ¬ 𝐵 < 𝐴))) |
Colors of variables: wff set class |
Syntax hints: ¬ wn 3 → wi 4 ∧ wa 103 ↔ wb 104 ∨ wo 698 = wceq 1343 ∈ wcel 2136 class class class wbr 3982 ℝcr 7752 < clt 7933 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 604 ax-in2 605 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-sep 4100 ax-pow 4153 ax-pr 4187 ax-un 4411 ax-setind 4514 ax-cnex 7844 ax-resscn 7845 ax-pre-ltirr 7865 ax-pre-apti 7868 |
This theorem depends on definitions: df-bi 116 df-3an 970 df-tru 1346 df-fal 1349 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ne 2337 df-nel 2432 df-ral 2449 df-rex 2450 df-rab 2453 df-v 2728 df-dif 3118 df-un 3120 df-in 3122 df-ss 3129 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-br 3983 df-opab 4044 df-xp 4610 df-pnf 7935 df-mnf 7936 df-ltxr 7938 |
This theorem is referenced by: letri3 7979 lttri3i 7996 lttri3d 8013 inelr 8482 lbinf 8843 suprubex 8846 suprlubex 8847 suprleubex 8849 sup3exmid 8852 suprzclex 9289 infrenegsupex 9532 supminfex 9535 infregelbex 9536 xrlttri3 9733 maxleim 11147 maxabs 11151 maxleast 11155 zsupcl 11880 zssinfcl 11881 infssuzledc 11883 suprzcl2dc 11888 dvdslegcd 11897 bezoutlemsup 11942 dfgcd2 11947 lcmgcdlem 12009 suplociccex 13243 pilem3 13344 taupi 13949 |
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