lelttrdi - Metamath Proof Explorer

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Theorem lelttrdi 11452

Description: If a number is less than another number, and the other number is less than or equal to a third number, the first number is less than the third number. (Contributed by Alexander van der Vekens, 24-Mar-2018.)

**Hypotheses**
Ref	Expression
lelttrdi.r	⊢ (𝜑 → (𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ))
lelttrdi.l	⊢ (𝜑 → 𝐵 ≤ 𝐶)

**Assertion**
Ref	Expression
lelttrdi	⊢ (𝜑 → (𝐴 < 𝐵 → 𝐴 < 𝐶))

**Proof of Theorem lelttrdi**
Step	Hyp	Ref	Expression
1		lelttrdi.r	. . . . 5 ⊢ (𝜑 → (𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ ∧ 𝐶 ∈ ℝ))
2	1	simp1d 1142	. . . 4 ⊢ (𝜑 → 𝐴 ∈ ℝ)
3	2	adantr 480	. . 3 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 ∈ ℝ)
4	1	simp2d 1143	. . . 4 ⊢ (𝜑 → 𝐵 ∈ ℝ)
5	4	adantr 480	. . 3 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐵 ∈ ℝ)
6	1	simp3d 1144	. . . 4 ⊢ (𝜑 → 𝐶 ∈ ℝ)
7	6	adantr 480	. . 3 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐶 ∈ ℝ)
8		simpr 484	. . 3 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 < 𝐵)
9		lelttrdi.l	. . . 4 ⊢ (𝜑 → 𝐵 ≤ 𝐶)
10	9	adantr 480	. . 3 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐵 ≤ 𝐶)
11	3, 5, 7, 8, 10	ltletrd 11450	. 2 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 < 𝐶)
12	11	ex 412	1 ⊢ (𝜑 → (𝐴 < 𝐵 → 𝐴 < 𝐶))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 ∧ w3a 1087 ∈ wcel 2108 class class class wbr 5166 ℝcr 11183 < clt 11324 ≤ cle 11325

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2158 ax-12 2178 ax-ext 2711 ax-sep 5317 ax-nul 5324 ax-pow 5383 ax-pr 5447 ax-un 7770 ax-resscn 11241 ax-pre-lttri 11258 ax-pre-lttrn 11259

This theorem depends on definitions: df-bi 207 df-an 396 df-or 847 df-3an 1089 df-tru 1540 df-fal 1550 df-ex 1778 df-nf 1782 df-sb 2065 df-mo 2543 df-eu 2572 df-clab 2718 df-cleq 2732 df-clel 2819 df-nfc 2895 df-ne 2947 df-nel 3053 df-ral 3068 df-rex 3077 df-rab 3444 df-v 3490 df-sbc 3805 df-csb 3922 df-dif 3979 df-un 3981 df-in 3983 df-ss 3993 df-nul 4353 df-if 4549 df-pw 4624 df-sn 4649 df-pr 4651 df-op 4655 df-uni 4932 df-br 5167 df-opab 5229 df-mpt 5250 df-id 5593 df-xp 5706 df-rel 5707 df-cnv 5708 df-co 5709 df-dm 5710 df-rn 5711 df-res 5712 df-ima 5713 df-iota 6525 df-fun 6575 df-fn 6576 df-f 6577 df-f1 6578 df-fo 6579 df-f1o 6580 df-fv 6581 df-er 8763 df-en 9004 df-dom 9005 df-sdom 9006 df-pnf 11326 df-mnf 11327 df-xr 11328 df-ltxr 11329 df-le 11330

This theorem is referenced by: difgtsumgt 12606 subfzo0 13839 eucrctshift 30275

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