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| Mirrors > Home > MPE Home > Th. List > Mathboxes > xrge0subcld | Structured version Visualization version GIF version | ||
| Description: Condition for closure of nonnegative extended reals under subtraction. (Contributed by Thierry Arnoux, 27-May-2020.) |
| Ref | Expression |
|---|---|
| xrge0subcld.a | ⊢ (𝜑 → 𝐴 ∈ (0[,]+∞)) |
| xrge0subcld.b | ⊢ (𝜑 → 𝐵 ∈ (0[,]+∞)) |
| xrge0subcld.c | ⊢ (𝜑 → 𝐵 ≤ 𝐴) |
| Ref | Expression |
|---|---|
| xrge0subcld | ⊢ (𝜑 → (𝐴 +𝑒 -𝑒𝐵) ∈ (0[,]+∞)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | iccssxr 13485 | . . . . 5 ⊢ (0[,]+∞) ⊆ ℝ* | |
| 2 | xrge0subcld.a | . . . . 5 ⊢ (𝜑 → 𝐴 ∈ (0[,]+∞)) | |
| 3 | 1, 2 | sselid 3932 | . . . 4 ⊢ (𝜑 → 𝐴 ∈ ℝ*) |
| 4 | xrge0subcld.b | . . . . . 6 ⊢ (𝜑 → 𝐵 ∈ (0[,]+∞)) | |
| 5 | 1, 4 | sselid 3932 | . . . . 5 ⊢ (𝜑 → 𝐵 ∈ ℝ*) |
| 6 | 5 | xnegcld 13354 | . . . 4 ⊢ (𝜑 → -𝑒𝐵 ∈ ℝ*) |
| 7 | 3, 6 | xaddcld 13355 | . . 3 ⊢ (𝜑 → (𝐴 +𝑒 -𝑒𝐵) ∈ ℝ*) |
| 8 | xrge0subcld.c | . . . 4 ⊢ (𝜑 → 𝐵 ≤ 𝐴) | |
| 9 | xsubge0 13315 | . . . . 5 ⊢ ((𝐴 ∈ ℝ* ∧ 𝐵 ∈ ℝ*) → (0 ≤ (𝐴 +𝑒 -𝑒𝐵) ↔ 𝐵 ≤ 𝐴)) | |
| 10 | 3, 5, 9 | syl2anc 596 | . . . 4 ⊢ (𝜑 → (0 ≤ (𝐴 +𝑒 -𝑒𝐵) ↔ 𝐵 ≤ 𝐴)) |
| 11 | 8, 10 | mpbird 260 | . . 3 ⊢ (𝜑 → 0 ≤ (𝐴 +𝑒 -𝑒𝐵)) |
| 12 | 7, 11 | jca 521 | . 2 ⊢ (𝜑 → ((𝐴 +𝑒 -𝑒𝐵) ∈ ℝ* ∧ 0 ≤ (𝐴 +𝑒 -𝑒𝐵))) |
| 13 | elxrge0 13512 | . 2 ⊢ ((𝐴 +𝑒 -𝑒𝐵) ∈ (0[,]+∞) ↔ ((𝐴 +𝑒 -𝑒𝐵) ∈ ℝ* ∧ 0 ≤ (𝐴 +𝑒 -𝑒𝐵))) | |
| 14 | 12, 13 | sylibr 237 | 1 ⊢ (𝜑 → (𝐴 +𝑒 -𝑒𝐵) ∈ (0[,]+∞)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∈ wcel 2145 class class class wbr 5107 (class class class)co 7416 0cc0 11127 +∞cpnf 11267 ℝ*cxr 11269 ≤ cle 11271 -𝑒cxne 13162 +𝑒 cxad 13163 [,]cicc 13403 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-sep 5255 ax-nul 5267 ax-pow 5334 ax-pr 5402 ax-un 7739 ax-cnex 11183 ax-resscn 11184 ax-1cn 11185 ax-icn 11186 ax-addcl 11187 ax-addrcl 11188 ax-mulcl 11189 ax-mulrcl 11190 ax-mulcom 11191 ax-addass 11192 ax-mulass 11193 ax-distr 11194 ax-i2m1 11195 ax-1ne0 11196 ax-1rid 11197 ax-rnegex 11198 ax-rrecex 11199 ax-cnre 11200 ax-pre-lttri 11201 ax-pre-lttrn 11202 ax-pre-ltadd 11203 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ne 2958 df-nel 3064 df-ral 3079 df-rex 3089 df-reu 3368 df-rab 3415 df-v 3455 df-sbc 3743 df-csb 3851 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-iun 4956 df-br 5108 df-opab 5172 df-mpt 5191 df-id 5554 df-po 5567 df-so 5568 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-iota 6493 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-fv 6545 df-riota 7373 df-ov 7419 df-oprab 7420 df-mpo 7421 df-1st 7989 df-2nd 7990 df-er 8699 df-en 8956 df-dom 8957 df-sdom 8958 df-pnf 11272 df-mnf 11273 df-xr 11274 df-ltxr 11275 df-le 11276 df-sub 11470 df-neg 11471 df-xneg 13165 df-xadd 13166 df-icc 13407 |
| This theorem is used by: carsgclctunlem2 34817 |
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