xreqnltd - Mathbox for Glauco Siliprandi

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Theorem xreqnltd 44777

Description: A consequence of trichotomy. (Contributed by Glauco Siliprandi, 23-Oct-2021.)

**Hypotheses**
Ref	Expression
xreqnltd.1	⊢ (𝜑 → 𝐴 ∈ ℝ^*)
xreqnltd.2	⊢ (𝜑 → 𝐴 = 𝐵)

**Assertion**
Ref	Expression
xreqnltd	⊢ (𝜑 → ¬ 𝐴 < 𝐵)

**Proof of Theorem xreqnltd**
Step	Hyp	Ref	Expression
1		xreqnltd.2	. . 3 ⊢ (𝜑 → 𝐴 = 𝐵)
2		xreqnltd.1	. . . 4 ⊢ (𝜑 → 𝐴 ∈ ℝ^*)
3	1, 2	eqeltrrd 2830	. . . 4 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
4		xrlttri3 13155	. . . 4 ⊢ ((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) → (𝐴 = 𝐵 ↔ (¬ 𝐴 < 𝐵 ∧ ¬ 𝐵 < 𝐴)))
5	2, 3, 4	syl2anc 583	. . 3 ⊢ (𝜑 → (𝐴 = 𝐵 ↔ (¬ 𝐴 < 𝐵 ∧ ¬ 𝐵 < 𝐴)))
6	1, 5	mpbid 231	. 2 ⊢ (𝜑 → (¬ 𝐴 < 𝐵 ∧ ¬ 𝐵 < 𝐴))
7	6	simpld 494	1 ⊢ (𝜑 → ¬ 𝐴 < 𝐵)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 395 = wceq 1534 ∈ wcel 2099 class class class wbr 5148 ℝ^*cxr 11278 < clt 11279

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2699 ax-sep 5299 ax-nul 5306 ax-pow 5365 ax-pr 5429 ax-un 7740 ax-cnex 11195 ax-resscn 11196 ax-pre-lttri 11213 ax-pre-lttrn 11214

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rab 3430 df-v 3473 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4909 df-br 5149 df-opab 5211 df-mpt 5232 df-id 5576 df-po 5590 df-so 5591 df-xp 5684 df-rel 5685 df-cnv 5686 df-co 5687 df-dm 5688 df-rn 5689 df-res 5690 df-ima 5691 df-iota 6500 df-fun 6550 df-fn 6551 df-f 6552 df-f1 6553 df-fo 6554 df-f1o 6555 df-fv 6556 df-er 8725 df-en 8965 df-dom 8966 df-sdom 8967 df-pnf 11281 df-mnf 11282 df-xr 11283 df-ltxr 11284

This theorem is referenced by: limsuppnflem 45098

	
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