| Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > MPE Home > Th. List > xrs1mnd | Structured version Visualization version GIF version | ||
| Description: The extended real numbers, restricted to ℝ* ∖ {-∞}, form an additive monoid - in contrast to the full structure, see xrsmgmdifsgrp 21524. (Contributed by Mario Carneiro, 27-Nov-2014.) |
| Ref | Expression |
|---|---|
| xrs1mnd.1 | ⊢ 𝑅 = (ℝ*𝑠 ↾s (ℝ* ∖ {-∞})) |
| Ref | Expression |
|---|---|
| xrs1mnd | ⊢ 𝑅 ∈ Mnd |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | difss 4098 | . . . 4 ⊢ (ℝ* ∖ {-∞}) ⊆ ℝ* | |
| 2 | xrs1mnd.1 | . . . . 5 ⊢ 𝑅 = (ℝ*𝑠 ↾s (ℝ* ∖ {-∞})) | |
| 3 | xrsbas 17656 | . . . . 5 ⊢ ℝ* = (Base‘ℝ*𝑠) | |
| 4 | 2, 3 | ressbas2 17294 | . . . 4 ⊢ ((ℝ* ∖ {-∞}) ⊆ ℝ* → (ℝ* ∖ {-∞}) = (Base‘𝑅)) |
| 5 | 1, 4 | mp1i 14 | . . 3 ⊢ (⊤ → (ℝ* ∖ {-∞}) = (Base‘𝑅)) |
| 6 | xrex 13007 | . . . . 5 ⊢ ℝ* ∈ V | |
| 7 | 6 | difexi 5298 | . . . 4 ⊢ (ℝ* ∖ {-∞}) ∈ V |
| 8 | xrsadd 21505 | . . . . 5 ⊢ +𝑒 = (+g‘ℝ*𝑠) | |
| 9 | 2, 8 | ressplusg 17340 | . . . 4 ⊢ ((ℝ* ∖ {-∞}) ∈ V → +𝑒 = (+g‘𝑅)) |
| 10 | 7, 9 | mp1i 14 | . . 3 ⊢ (⊤ → +𝑒 = (+g‘𝑅)) |
| 11 | eldifsn 4755 | . . . . 5 ⊢ (𝑥 ∈ (ℝ* ∖ {-∞}) ↔ (𝑥 ∈ ℝ* ∧ 𝑥 ≠ -∞)) | |
| 12 | eldifsn 4755 | . . . . 5 ⊢ (𝑦 ∈ (ℝ* ∖ {-∞}) ↔ (𝑦 ∈ ℝ* ∧ 𝑦 ≠ -∞)) | |
| 13 | xaddcl 13261 | . . . . . . 7 ⊢ ((𝑥 ∈ ℝ* ∧ 𝑦 ∈ ℝ*) → (𝑥 +𝑒 𝑦) ∈ ℝ*) | |
| 14 | 13 | ad2ant2r 759 | . . . . . 6 ⊢ (((𝑥 ∈ ℝ* ∧ 𝑥 ≠ -∞) ∧ (𝑦 ∈ ℝ* ∧ 𝑦 ≠ -∞)) → (𝑥 +𝑒 𝑦) ∈ ℝ*) |
| 15 | xaddnemnf 13258 | . . . . . 6 ⊢ (((𝑥 ∈ ℝ* ∧ 𝑥 ≠ -∞) ∧ (𝑦 ∈ ℝ* ∧ 𝑦 ≠ -∞)) → (𝑥 +𝑒 𝑦) ≠ -∞) | |
| 16 | eldifsn 4755 | . . . . . 6 ⊢ ((𝑥 +𝑒 𝑦) ∈ (ℝ* ∖ {-∞}) ↔ ((𝑥 +𝑒 𝑦) ∈ ℝ* ∧ (𝑥 +𝑒 𝑦) ≠ -∞)) | |
| 17 | 14, 15, 16 | sylanbrc 594 | . . . . 5 ⊢ (((𝑥 ∈ ℝ* ∧ 𝑥 ≠ -∞) ∧ (𝑦 ∈ ℝ* ∧ 𝑦 ≠ -∞)) → (𝑥 +𝑒 𝑦) ∈ (ℝ* ∖ {-∞})) |
| 18 | 11, 12, 17 | syl2anb 609 | . . . 4 ⊢ ((𝑥 ∈ (ℝ* ∖ {-∞}) ∧ 𝑦 ∈ (ℝ* ∖ {-∞})) → (𝑥 +𝑒 𝑦) ∈ (ℝ* ∖ {-∞})) |
| 19 | 18 | 3adant1 1146 | . . 3 ⊢ ((⊤ ∧ 𝑥 ∈ (ℝ* ∖ {-∞}) ∧ 𝑦 ∈ (ℝ* ∖ {-∞})) → (𝑥 +𝑒 𝑦) ∈ (ℝ* ∖ {-∞})) |
| 20 | eldifsn 4755 | . . . . 5 ⊢ (𝑧 ∈ (ℝ* ∖ {-∞}) ↔ (𝑧 ∈ ℝ* ∧ 𝑧 ≠ -∞)) | |
| 21 | xaddass 13271 | . . . . 5 ⊢ (((𝑥 ∈ ℝ* ∧ 𝑥 ≠ -∞) ∧ (𝑦 ∈ ℝ* ∧ 𝑦 ≠ -∞) ∧ (𝑧 ∈ ℝ* ∧ 𝑧 ≠ -∞)) → ((𝑥 +𝑒 𝑦) +𝑒 𝑧) = (𝑥 +𝑒 (𝑦 +𝑒 𝑧))) | |
| 22 | 11, 12, 20, 21 | syl3anb 1177 | . . . 4 ⊢ ((𝑥 ∈ (ℝ* ∖ {-∞}) ∧ 𝑦 ∈ (ℝ* ∖ {-∞}) ∧ 𝑧 ∈ (ℝ* ∖ {-∞})) → ((𝑥 +𝑒 𝑦) +𝑒 𝑧) = (𝑥 +𝑒 (𝑦 +𝑒 𝑧))) |
| 23 | 22 | adantl 486 | . . 3 ⊢ ((⊤ ∧ (𝑥 ∈ (ℝ* ∖ {-∞}) ∧ 𝑦 ∈ (ℝ* ∖ {-∞}) ∧ 𝑧 ∈ (ℝ* ∖ {-∞}))) → ((𝑥 +𝑒 𝑦) +𝑒 𝑧) = (𝑥 +𝑒 (𝑦 +𝑒 𝑧))) |
| 24 | 0re 11206 | . . . 4 ⊢ 0 ∈ ℝ | |
| 25 | rexr 11251 | . . . . 5 ⊢ (0 ∈ ℝ → 0 ∈ ℝ*) | |
| 26 | renemnf 11254 | . . . . 5 ⊢ (0 ∈ ℝ → 0 ≠ -∞) | |
| 27 | eldifsn 4755 | . . . . 5 ⊢ (0 ∈ (ℝ* ∖ {-∞}) ↔ (0 ∈ ℝ* ∧ 0 ≠ -∞)) | |
| 28 | 25, 26, 27 | sylanbrc 594 | . . . 4 ⊢ (0 ∈ ℝ → 0 ∈ (ℝ* ∖ {-∞})) |
| 29 | 24, 28 | mp1i 14 | . . 3 ⊢ (⊤ → 0 ∈ (ℝ* ∖ {-∞})) |
| 30 | eldifi 4093 | . . . . 5 ⊢ (𝑥 ∈ (ℝ* ∖ {-∞}) → 𝑥 ∈ ℝ*) | |
| 31 | 30 | adantl 486 | . . . 4 ⊢ ((⊤ ∧ 𝑥 ∈ (ℝ* ∖ {-∞})) → 𝑥 ∈ ℝ*) |
| 32 | xaddlid 13264 | . . . 4 ⊢ (𝑥 ∈ ℝ* → (0 +𝑒 𝑥) = 𝑥) | |
| 33 | 31, 32 | syl 18 | . . 3 ⊢ ((⊤ ∧ 𝑥 ∈ (ℝ* ∖ {-∞})) → (0 +𝑒 𝑥) = 𝑥) |
| 34 | 31 | xaddridd 13265 | . . 3 ⊢ ((⊤ ∧ 𝑥 ∈ (ℝ* ∖ {-∞})) → (𝑥 +𝑒 0) = 𝑥) |
| 35 | 5, 10, 19, 23, 29, 33, 34 | ismndd 18810 | . 2 ⊢ (⊤ → 𝑅 ∈ Mnd) |
| 36 | 35 | mptru 1574 | 1 ⊢ 𝑅 ∈ Mnd |
| Colors of variables: wff setvar class |
| Syntax hints: ∧ wa 400 ∧ w3a 1101 = wceq 1567 ⊤wtru 1568 ∈ wcel 2149 ≠ wne 2964 Vcvv 3463 ∖ cdif 3910 ⊆ wss 3913 {csn 4591 ‘cfv 6533 (class class class)co 7408 ℝcr 11095 0cc0 11096 -∞cmnf 11237 ℝ*cxr 11238 +𝑒 cxad 13131 Basecbs 17265 ↾s cress 17286 +gcplusg 17306 ℝ*𝑠cxrs 17550 Mndcmnd 18788 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1822 ax-4 1836 ax-5 1937 ax-6 1994 ax-7 2035 ax-8 2151 ax-9 2159 ax-10 2182 ax-11 2198 ax-12 2219 ax-ext 2741 ax-sep 5258 ax-nul 5268 ax-pow 5334 ax-pr 5402 ax-un 7730 ax-cnex 11152 ax-resscn 11153 ax-1cn 11154 ax-icn 11155 ax-addcl 11156 ax-addrcl 11157 ax-mulcl 11158 ax-mulrcl 11159 ax-mulcom 11160 ax-addass 11161 ax-mulass 11162 ax-distr 11163 ax-i2m1 11164 ax-1ne0 11165 ax-1rid 11166 ax-rnegex 11167 ax-rrecex 11168 ax-cnre 11169 ax-pre-lttri 11170 ax-pre-lttrn 11171 ax-pre-ltadd 11172 ax-pre-mulgt0 11173 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1570 df-fal 1580 df-ex 1807 df-nf 1811 df-sb 2098 df-mo 2573 df-eu 2603 df-clab 2748 df-cleq 2761 df-clel 2844 df-nfc 2918 df-ne 2965 df-nel 3071 df-ral 3086 df-rex 3096 df-reu 3377 df-rab 3424 df-v 3465 df-sbc 3754 df-csb 3862 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4490 df-pw 4566 df-sn 4592 df-pr 4594 df-tp 4596 df-op 4598 df-uni 4874 df-iun 4959 df-br 5111 df-opab 5175 df-mpt 5194 df-tr 5220 df-id 5554 df-eprel 5559 df-po 5567 df-so 5568 df-fr 5612 df-we 5614 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-pred 6299 df-ord 6360 df-on 6361 df-lim 6362 df-suc 6363 df-iota 6489 df-fun 6535 df-fn 6536 df-f 6537 df-f1 6538 df-fo 6539 df-f1o 6540 df-fv 6541 df-riota 7365 df-ov 7411 df-oprab 7412 df-mpo 7413 df-om 7859 df-1st 7982 df-2nd 7983 df-frecs 8274 df-wrecs 8305 df-recs 8354 df-rdg 8393 df-1o 8449 df-er 8690 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-pnf 11241 df-mnf 11242 df-xr 11243 df-ltxr 11244 df-le 11245 df-sub 11439 df-neg 11440 df-nn 12230 df-2 12299 df-3 12300 df-4 12301 df-5 12302 df-6 12303 df-7 12304 df-8 12305 df-9 12306 df-n0 12501 df-z 12588 df-dec 12708 df-uz 12859 df-xadd 13134 df-fz 13532 df-struct 17203 df-sets 17220 df-slot 17238 df-ndx 17250 df-base 17266 df-ress 17287 df-plusg 17319 df-mulr 17320 df-tset 17325 df-ple 17326 df-ds 17328 df-xrs 17552 df-mgm 18694 df-sgrp 18773 df-mnd 18789 |
| This theorem is referenced by: xrs1cmn 21557 xrge0subm 21558 xrge00 33271 |
| Copyright terms: Public domain | W3C validator |