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Related theorems GIF version |
| Description: 'Less than or equal to' expressed in terms of 'less than'. |
| Ref | Expression |
|---|---|
| leltt | ⊢ ((A ∈ ℝ ∧ B ∈ ℝ) → (A ≤ B ↔ ¬ B < A)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | opelxpi 2455 | . . . 4 ⊢ ((A ∈ ℝ ∧ B ∈ ℝ) → 〈A, B〉 ∈ (ℝ × ℝ)) | |
| 2 | df-le 4277 | . . . . . . 7 ⊢ ≤ = ((ℝ × ℝ) ∖ ◡ < ) | |
| 3 | 2 | eleq2i 1153 | . . . . . 6 ⊢ (〈A, B〉 ∈ ≤ ↔ 〈A, B〉 ∈ ((ℝ × ℝ) ∖ ◡ < )) |
| 4 | eldif 1496 | . . . . . 6 ⊢ (〈A, B〉 ∈ ((ℝ × ℝ) ∖ ◡ < ) ↔ (〈A, B〉 ∈ (ℝ × ℝ) ∧ ¬ 〈A, B〉 ∈ ◡ < )) | |
| 5 | 3, 4 | bitr 151 | . . . . 5 ⊢ (〈A, B〉 ∈ ≤ ↔ (〈A, B〉 ∈ (ℝ × ℝ) ∧ ¬ 〈A, B〉 ∈ ◡ < )) |
| 6 | 5 | baib 506 | . . . 4 ⊢ (〈A, B〉 ∈ (ℝ × ℝ) → (〈A, B〉 ∈ ≤ ↔ ¬ 〈A, B〉 ∈ ◡ < )) |
| 7 | 1, 6 | syl 12 | . . 3 ⊢ ((A ∈ ℝ ∧ B ∈ ℝ) → (〈A, B〉 ∈ ≤ ↔ ¬ 〈A, B〉 ∈ ◡ < )) |
| 8 | df-br 2063 | . . 3 ⊢ (A ≤ B ↔ 〈A, B〉 ∈ ≤ ) | |
| 9 | 7, 8 | syl5bb 410 | . 2 ⊢ ((A ∈ ℝ ∧ B ∈ ℝ) → (A ≤ B ↔ ¬ 〈A, B〉 ∈ ◡ < )) |
| 10 | opelcnvg 2517 | . . . 4 ⊢ ((A ∈ ℝ ∧ B ∈ ℝ) → (〈A, B〉 ∈ ◡ < ↔ 〈B, A〉 ∈ < )) | |
| 11 | df-br 2063 | . . . 4 ⊢ (B < A ↔ 〈B, A〉 ∈ < ) | |
| 12 | 10, 11 | syl6rbbr 417 | . . 3 ⊢ ((A ∈ ℝ ∧ B ∈ ℝ) → (B < A ↔ 〈A, B〉 ∈ ◡ < )) |
| 13 | 12 | negbid 463 | . 2 ⊢ ((A ∈ ℝ ∧ B ∈ ℝ) → (¬ B < A ↔ ¬ 〈A, B〉 ∈ ◡ < )) |
| 14 | 9, 13 | bitr4d 409 | 1 ⊢ ((A ∈ ℝ ∧ B ∈ ℝ) → (A ≤ B ↔ ¬ B < A)) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 1 → wi 2 ↔ wb 127 ∧ wa 196 ∈ wcel 1092 ∖ cdif 1484 〈cop 1810 class class class wbr 2054 × cxp 2408 ◡ccnv 2409 ℝcr 4027 < clt 4033 ≤ cle 4092 |
| This theorem is referenced by: letri3t 4283 leloet 4284 lenltt 4285 lelt 4301 ltaddsubt 4357 ledivt 4405 nnge1t 4439 lt1nnn 4442 nnleltp1t 4448 suprub 4513 nn0ge0t 4550 nn0ltp1let 4556 elnnz1 4581 zltp1let 4597 uzwo 4605 nnwoOLD 4608 indstr 4611 zbtwnre 4619 sqr0 4730 znnenlem 4929 znnen 4930 projlem13 5205 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-pow 1077 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-op 1815 df-br 2063 df-opab 2098 df-xp 2424 df-cnv 2426 df-le 4277 |