lelttrdi - Metamath Proof Explorer

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Theorem lelttrdi 11380

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 1139	. . . 4 ⊢ (𝜑 → 𝐴 ∈ ℝ)
3	2	adantr 480	. . 3 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 ∈ ℝ)
4	1	simp2d 1140	. . . 4 ⊢ (𝜑 → 𝐵 ∈ ℝ)
5	4	adantr 480	. . 3 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐵 ∈ ℝ)
6	1	simp3d 1141	. . . 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 11378	. 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 1084 ∈ wcel 2098 class class class wbr 5141 ℝcr 11111 < clt 11252 ≤ cle 11253

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2163 ax-ext 2697 ax-sep 5292 ax-nul 5299 ax-pow 5356 ax-pr 5420 ax-un 7722 ax-resscn 11169 ax-pre-lttri 11186 ax-pre-lttrn 11187

This theorem depends on definitions: df-bi 206 df-an 396 df-or 845 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2528 df-eu 2557 df-clab 2704 df-cleq 2718 df-clel 2804 df-nfc 2879 df-ne 2935 df-nel 3041 df-ral 3056 df-rex 3065 df-rab 3427 df-v 3470 df-sbc 3773 df-csb 3889 df-dif 3946 df-un 3948 df-in 3950 df-ss 3960 df-nul 4318 df-if 4524 df-pw 4599 df-sn 4624 df-pr 4626 df-op 4630 df-uni 4903 df-br 5142 df-opab 5204 df-mpt 5225 df-id 5567 df-xp 5675 df-rel 5676 df-cnv 5677 df-co 5678 df-dm 5679 df-rn 5680 df-res 5681 df-ima 5682 df-iota 6489 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-er 8705 df-en 8942 df-dom 8943 df-sdom 8944 df-pnf 11254 df-mnf 11255 df-xr 11256 df-ltxr 11257 df-le 11258

This theorem is referenced by: difgtsumgt 12529 subfzo0 13760 eucrctshift 30005

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