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Mirrors > Home > MPE Home > Th. List > ltlen | Structured version Visualization version GIF version |
Description: 'Less than' expressed in terms of 'less than or equal to'. (Contributed by NM, 27-Oct-1999.) |
Ref | Expression |
---|---|
ltlen | ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 < 𝐵 ↔ (𝐴 ≤ 𝐵 ∧ 𝐵 ≠ 𝐴))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ltle 10921 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 < 𝐵 → 𝐴 ≤ 𝐵)) | |
2 | ltne 10929 | . . . . 5 ⊢ ((𝐴 ∈ ℝ ∧ 𝐴 < 𝐵) → 𝐵 ≠ 𝐴) | |
3 | 2 | ex 416 | . . . 4 ⊢ (𝐴 ∈ ℝ → (𝐴 < 𝐵 → 𝐵 ≠ 𝐴)) |
4 | 3 | adantr 484 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 < 𝐵 → 𝐵 ≠ 𝐴)) |
5 | 1, 4 | jcad 516 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 < 𝐵 → (𝐴 ≤ 𝐵 ∧ 𝐵 ≠ 𝐴))) |
6 | leloe 10919 | . . . 4 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 ≤ 𝐵 ↔ (𝐴 < 𝐵 ∨ 𝐴 = 𝐵))) | |
7 | df-ne 2941 | . . . . . 6 ⊢ (𝐵 ≠ 𝐴 ↔ ¬ 𝐵 = 𝐴) | |
8 | pm2.24 124 | . . . . . . 7 ⊢ (𝐵 = 𝐴 → (¬ 𝐵 = 𝐴 → 𝐴 < 𝐵)) | |
9 | 8 | eqcoms 2745 | . . . . . 6 ⊢ (𝐴 = 𝐵 → (¬ 𝐵 = 𝐴 → 𝐴 < 𝐵)) |
10 | 7, 9 | syl5bi 245 | . . . . 5 ⊢ (𝐴 = 𝐵 → (𝐵 ≠ 𝐴 → 𝐴 < 𝐵)) |
11 | 10 | jao1i 858 | . . . 4 ⊢ ((𝐴 < 𝐵 ∨ 𝐴 = 𝐵) → (𝐵 ≠ 𝐴 → 𝐴 < 𝐵)) |
12 | 6, 11 | syl6bi 256 | . . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 ≤ 𝐵 → (𝐵 ≠ 𝐴 → 𝐴 < 𝐵))) |
13 | 12 | impd 414 | . 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → ((𝐴 ≤ 𝐵 ∧ 𝐵 ≠ 𝐴) → 𝐴 < 𝐵)) |
14 | 5, 13 | impbid 215 | 1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 < 𝐵 ↔ (𝐴 ≤ 𝐵 ∧ 𝐵 ≠ 𝐴))) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 → wi 4 ↔ wb 209 ∧ wa 399 ∨ wo 847 = wceq 1543 ∈ wcel 2110 ≠ wne 2940 class class class wbr 5053 ℝcr 10728 < clt 10867 ≤ cle 10868 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1976 ax-7 2016 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2158 ax-12 2175 ax-ext 2708 ax-sep 5192 ax-nul 5199 ax-pow 5258 ax-pr 5322 ax-un 7523 ax-resscn 10786 ax-pre-lttri 10803 ax-pre-lttrn 10804 |
This theorem depends on definitions: df-bi 210 df-an 400 df-or 848 df-3or 1090 df-3an 1091 df-tru 1546 df-fal 1556 df-ex 1788 df-nf 1792 df-sb 2071 df-mo 2539 df-eu 2568 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2886 df-ne 2941 df-nel 3047 df-ral 3066 df-rex 3067 df-rab 3070 df-v 3410 df-sbc 3695 df-csb 3812 df-dif 3869 df-un 3871 df-in 3873 df-ss 3883 df-nul 4238 df-if 4440 df-pw 4515 df-sn 4542 df-pr 4544 df-op 4548 df-uni 4820 df-br 5054 df-opab 5116 df-mpt 5136 df-id 5455 df-po 5468 df-so 5469 df-xp 5557 df-rel 5558 df-cnv 5559 df-co 5560 df-dm 5561 df-rn 5562 df-res 5563 df-ima 5564 df-iota 6338 df-fun 6382 df-fn 6383 df-f 6384 df-f1 6385 df-fo 6386 df-f1o 6387 df-fv 6388 df-er 8391 df-en 8627 df-dom 8628 df-sdom 8629 df-pnf 10869 df-mnf 10870 df-xr 10871 df-ltxr 10872 df-le 10873 |
This theorem is referenced by: ltleni 10950 ltlend 10977 nn0lt2 12240 rpneg 12618 fzofzim 13289 elfznelfzob 13348 hashsdom 13948 cnpart 14803 oddprmgt2 16256 chfacfisf 21751 chfacfisfcpmat 21752 ang180lem2 25693 mumullem2 26062 lgsneg 26202 lgsdilem 26205 lgsdirprm 26212 2sqreultlem 26328 2sqreunnltlem 26331 axlowdimlem16 27048 unitdivcld 31565 zltp1ne 32781 poimirlem24 35538 itg2addnclem 35565 fzopredsuc 44488 iccpartiltu 44547 icceuelpartlem 44560 difmodm1lt 45541 |
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