xrltletr - Metamath Proof Explorer

	Metamath Proof Explorer		< Previous Next > Nearby theorems
Mirrors > Home > MPE Home > Th. List > xrltletr		Structured version Visualization version GIF version

Theorem xrltletr 12820

Description: Transitive law for ordering on extended reals. (Contributed by NM, 19-Jan-2006.)

**Assertion**
Ref	Expression
xrltletr	⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → ((𝐴 < 𝐵 ∧ 𝐵 ≤ 𝐶) → 𝐴 < 𝐶))

**Proof of Theorem xrltletr**
Step	Hyp	Ref	Expression
1		xrleloe 12807	. . . 4 ⊢ ((𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → (𝐵 ≤ 𝐶 ↔ (𝐵 < 𝐶 ∨ 𝐵 = 𝐶)))
2	1	3adant1 1128	. . 3 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → (𝐵 ≤ 𝐶 ↔ (𝐵 < 𝐶 ∨ 𝐵 = 𝐶)))
3		xrlttr 12803	. . . . 5 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → ((𝐴 < 𝐵 ∧ 𝐵 < 𝐶) → 𝐴 < 𝐶))
4	3	expcomd 416	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → (𝐵 < 𝐶 → (𝐴 < 𝐵 → 𝐴 < 𝐶)))
5		breq2 5074	. . . . . 6 ⊢ (𝐵 = 𝐶 → (𝐴 < 𝐵 ↔ 𝐴 < 𝐶))
6	5	biimpd 228	. . . . 5 ⊢ (𝐵 = 𝐶 → (𝐴 < 𝐵 → 𝐴 < 𝐶))
7	6	a1i 11	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → (𝐵 = 𝐶 → (𝐴 < 𝐵 → 𝐴 < 𝐶)))
8	4, 7	jaod 855	. . 3 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → ((𝐵 < 𝐶 ∨ 𝐵 = 𝐶) → (𝐴 < 𝐵 → 𝐴 < 𝐶)))
9	2, 8	sylbid 239	. 2 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → (𝐵 ≤ 𝐶 → (𝐴 < 𝐵 → 𝐴 < 𝐶)))
10	9	impcomd 411	1 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^* ∧ 𝐶 ∈ ℝ^*) → ((𝐴 < 𝐵 ∧ 𝐵 ≤ 𝐶) → 𝐴 < 𝐶))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 395 ∨ wo 843 ∧ w3a 1085 = wceq 1539 ∈ wcel 2108 class class class wbr 5070 ℝ^*cxr 10939 < clt 10940 ≤ cle 10941

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-cnex 10858 ax-resscn 10859 ax-pre-lttri 10876 ax-pre-lttrn 10877

This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-op 4565 df-uni 4837 df-br 5071 df-opab 5133 df-mpt 5154 df-id 5480 df-po 5494 df-so 5495 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946

This theorem is referenced by: xrltletrd 12824 xrre2 12833 xrre3 12834 ge0gtmnf 12835 xrltmin 12845 supxrunb1 12982 iooss2 13044 ioc0 13055 iccssioo 13077 icossico 13078 icossioo 13101 ioossioo 13102 icoun 13136 ioounsn 13138 ioojoin 13144 lecldbas 22278 mnfnei 22280 icopnfcld 23837 ovolicopnf 24593 voliunlem3 24621 volsup 24625 ioombl 24634 volivth 24676 itg2seq 24812 itg2monolem2 24821 dvfsumrlimge0 25099 dvfsumrlim2 25101 itgsubst 25118 abelth 25505 tanord1 25598 rlimcnp 26020 rlimcnp2 26021 dchrisum0lem2a 26570 pnt 26667 joiniooico 30997 esumfsup 31938 lfuhgr2 32980 relowlssretop 35461 heicant 35739 itg2gt0cn 35759 asindmre 35787 nltle2tri 44693 i0oii 46101

W3C validator