lelttrdi - Metamath Proof Explorer

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Theorem lelttrdi 10802

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 1138	. . . 4 ⊢ (𝜑 → 𝐴 ∈ ℝ)
3	2	adantr 483	. . 3 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 ∈ ℝ)
4	1	simp2d 1139	. . . 4 ⊢ (𝜑 → 𝐵 ∈ ℝ)
5	4	adantr 483	. . 3 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐵 ∈ ℝ)
6	1	simp3d 1140	. . . 4 ⊢ (𝜑 → 𝐶 ∈ ℝ)
7	6	adantr 483	. . 3 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐶 ∈ ℝ)
8		simpr 487	. . 3 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 < 𝐵)
9		lelttrdi.l	. . . 4 ⊢ (𝜑 → 𝐵 ≤ 𝐶)
10	9	adantr 483	. . 3 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐵 ≤ 𝐶)
11	3, 5, 7, 8, 10	ltletrd 10800	. 2 ⊢ ((𝜑 ∧ 𝐴 < 𝐵) → 𝐴 < 𝐶)
12	11	ex 415	1 ⊢ (𝜑 → (𝐴 < 𝐵 → 𝐴 < 𝐶))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 398 ∧ w3a 1083 ∈ wcel 2114 class class class wbr 5066 ℝcr 10536 < clt 10675 ≤ cle 10676

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 ax-resscn 10594 ax-pre-lttri 10611 ax-pre-lttrn 10612

This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-nel 3124 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-sbc 3773 df-csb 3884 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4839 df-br 5067 df-opab 5129 df-mpt 5147 df-id 5460 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-iota 6314 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-fv 6363 df-er 8289 df-en 8510 df-dom 8511 df-sdom 8512 df-pnf 10677 df-mnf 10678 df-xr 10679 df-ltxr 10680 df-le 10681

This theorem is referenced by: difgtsumgt 11951 subfzo0 13160 eucrctshift 28022

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