xrge0addcld - Mathbox for Thierry Arnoux

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Theorem xrge0addcld 32526

Description: Nonnegative extended reals are closed under addition. (Contributed by Thierry Arnoux, 16-Sep-2019.)

**Hypotheses**
Ref	Expression
xrge0addcld.a	⊢ (𝜑 → 𝐴 ∈ (0[,]+∞))
xrge0addcld.b	⊢ (𝜑 → 𝐵 ∈ (0[,]+∞))

**Assertion**
Ref	Expression
xrge0addcld	⊢ (𝜑 → (𝐴 +_𝑒 𝐵) ∈ (0[,]+∞))

**Proof of Theorem xrge0addcld**
Step	Hyp	Ref	Expression
1		xrge0addcld.a	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ (0[,]+∞))
2		elxrge0 13460	. . . . 5 ⊢ (𝐴 ∈ (0[,]+∞) ↔ (𝐴 ∈ ℝ^* ∧ 0 ≤ 𝐴))
3	1, 2	sylib 217	. . . 4 ⊢ (𝜑 → (𝐴 ∈ ℝ^* ∧ 0 ≤ 𝐴))
4	3	simpld 494	. . 3 ⊢ (𝜑 → 𝐴 ∈ ℝ^*)
5		xrge0addcld.b	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ (0[,]+∞))
6		elxrge0 13460	. . . . 5 ⊢ (𝐵 ∈ (0[,]+∞) ↔ (𝐵 ∈ ℝ^* ∧ 0 ≤ 𝐵))
7	5, 6	sylib 217	. . . 4 ⊢ (𝜑 → (𝐵 ∈ ℝ^* ∧ 0 ≤ 𝐵))
8	7	simpld 494	. . 3 ⊢ (𝜑 → 𝐵 ∈ ℝ^*)
9	4, 8	xaddcld 13306	. 2 ⊢ (𝜑 → (𝐴 +_𝑒 𝐵) ∈ ℝ^*)
10	3	simprd 495	. . 3 ⊢ (𝜑 → 0 ≤ 𝐴)
11	7	simprd 495	. . 3 ⊢ (𝜑 → 0 ≤ 𝐵)
12		xaddge0 13263	. . 3 ⊢ (((𝐴 ∈ ℝ^* ∧ 𝐵 ∈ ℝ^*) ∧ (0 ≤ 𝐴 ∧ 0 ≤ 𝐵)) → 0 ≤ (𝐴 +_𝑒 𝐵))
13	4, 8, 10, 11, 12	syl22anc 838	. 2 ⊢ (𝜑 → 0 ≤ (𝐴 +_𝑒 𝐵))
14		elxrge0 13460	. 2 ⊢ ((𝐴 +_𝑒 𝐵) ∈ (0[,]+∞) ↔ ((𝐴 +_𝑒 𝐵) ∈ ℝ^* ∧ 0 ≤ (𝐴 +_𝑒 𝐵)))
15	9, 13, 14	sylanbrc 582	1 ⊢ (𝜑 → (𝐴 +_𝑒 𝐵) ∈ (0[,]+∞))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 ∈ wcel 2099 class class class wbr 5142 (class class class)co 7414 0cc0 11132 +∞cpnf 11269 ℝ^*cxr 11271 ≤ cle 11273 +_𝑒 cxad 13116 [,]cicc 13353

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 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11188 ax-resscn 11189 ax-1cn 11190 ax-icn 11191 ax-addcl 11192 ax-addrcl 11193 ax-mulcl 11194 ax-mulrcl 11195 ax-mulcom 11196 ax-addass 11197 ax-mulass 11198 ax-distr 11199 ax-i2m1 11200 ax-1ne0 11201 ax-1rid 11202 ax-rnegex 11203 ax-rrecex 11204 ax-cnre 11205 ax-pre-lttri 11206 ax-pre-lttrn 11207 ax-pre-ltadd 11208

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 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-op 4631 df-uni 4904 df-iun 4993 df-br 5143 df-opab 5205 df-mpt 5226 df-id 5570 df-po 5584 df-so 5585 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-ov 7417 df-oprab 7418 df-mpo 7419 df-1st 7987 df-2nd 7988 df-er 8718 df-en 8958 df-dom 8959 df-sdom 8960 df-pnf 11274 df-mnf 11275 df-xr 11276 df-ltxr 11277 df-le 11278 df-xadd 13119 df-icc 13357

This theorem is referenced by: omssubadd 33914

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