ltaddpos2 - Intuitionistic Logic Explorer

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Theorem ltaddpos2 8413

Description: Adding a positive number to another number increases it. (Contributed by NM, 8-Apr-2005.)

**Assertion**
Ref	Expression
ltaddpos2	⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (0 < 𝐴 ↔ 𝐵 < (𝐴 + 𝐵)))

**Proof of Theorem ltaddpos2**
Step	Hyp	Ref	Expression
1		ltaddpos 8412	. 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (0 < 𝐴 ↔ 𝐵 < (𝐵 + 𝐴)))
2		recn 7947	. . . 4 ⊢ (𝐴 ∈ ℝ → 𝐴 ∈ ℂ)
3		recn 7947	. . . 4 ⊢ (𝐵 ∈ ℝ → 𝐵 ∈ ℂ)
4		addcom 8097	. . . 4 ⊢ ((𝐴 ∈ ℂ ∧ 𝐵 ∈ ℂ) → (𝐴 + 𝐵) = (𝐵 + 𝐴))
5	2, 3, 4	syl2an 289	. . 3 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐴 + 𝐵) = (𝐵 + 𝐴))
6	5	breq2d 4017	. 2 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (𝐵 < (𝐴 + 𝐵) ↔ 𝐵 < (𝐵 + 𝐴)))
7	1, 6	bitr4d 191	1 ⊢ ((𝐴 ∈ ℝ ∧ 𝐵 ∈ ℝ) → (0 < 𝐴 ↔ 𝐵 < (𝐴 + 𝐵)))

Colors of variables: wff set class

Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1353 ∈ wcel 2148 class class class wbr 4005 (class class class)co 5878 ℂcc 7812 ℝcr 7813 0cc0 7814 + caddc 7817 < clt 7995

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 614 ax-in2 615 ax-io 709 ax-5 1447 ax-7 1448 ax-gen 1449 ax-ie1 1493 ax-ie2 1494 ax-8 1504 ax-10 1505 ax-11 1506 ax-i12 1507 ax-bndl 1509 ax-4 1510 ax-17 1526 ax-i9 1530 ax-ial 1534 ax-i5r 1535 ax-13 2150 ax-14 2151 ax-ext 2159 ax-sep 4123 ax-pow 4176 ax-pr 4211 ax-un 4435 ax-setind 4538 ax-cnex 7905 ax-resscn 7906 ax-1cn 7907 ax-1re 7908 ax-icn 7909 ax-addcl 7910 ax-addrcl 7911 ax-mulcl 7912 ax-addcom 7914 ax-addass 7916 ax-i2m1 7919 ax-0id 7922 ax-rnegex 7923 ax-pre-ltadd 7930

This theorem depends on definitions: df-bi 117 df-3an 980 df-tru 1356 df-fal 1359 df-nf 1461 df-sb 1763 df-eu 2029 df-mo 2030 df-clab 2164 df-cleq 2170 df-clel 2173 df-nfc 2308 df-ne 2348 df-nel 2443 df-ral 2460 df-rex 2461 df-rab 2464 df-v 2741 df-dif 3133 df-un 3135 df-in 3137 df-ss 3144 df-pw 3579 df-sn 3600 df-pr 3601 df-op 3603 df-uni 3812 df-br 4006 df-opab 4067 df-xp 4634 df-iota 5180 df-fv 5226 df-ov 5881 df-pnf 7997 df-mnf 7998 df-ltxr 8000

This theorem is referenced by: ltaddpos2d 8490 nn1gt1 8956 pockthi 12359

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