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| 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 21375. (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 4090 | . . . 4 ⊢ (ℝ* ∖ {-∞}) ⊆ ℝ* | |
| 2 | xrs1mnd.1 | . . . . 5 ⊢ 𝑅 = (ℝ*𝑠 ↾s (ℝ* ∖ {-∞})) | |
| 3 | xrsbas 17539 | . . . . 5 ⊢ ℝ* = (Base‘ℝ*𝑠) | |
| 4 | 2, 3 | ressbas2 17177 | . . . 4 ⊢ ((ℝ* ∖ {-∞}) ⊆ ℝ* → (ℝ* ∖ {-∞}) = (Base‘𝑅)) |
| 5 | 1, 4 | mp1i 13 | . . 3 ⊢ (⊤ → (ℝ* ∖ {-∞}) = (Base‘𝑅)) |
| 6 | xrex 12912 | . . . . 5 ⊢ ℝ* ∈ V | |
| 7 | 6 | difexi 5277 | . . . 4 ⊢ (ℝ* ∖ {-∞}) ∈ V |
| 8 | xrsadd 21352 | . . . . 5 ⊢ +𝑒 = (+g‘ℝ*𝑠) | |
| 9 | 2, 8 | ressplusg 17223 | . . . 4 ⊢ ((ℝ* ∖ {-∞}) ∈ V → +𝑒 = (+g‘𝑅)) |
| 10 | 7, 9 | mp1i 13 | . . 3 ⊢ (⊤ → +𝑒 = (+g‘𝑅)) |
| 11 | eldifsn 4744 | . . . . 5 ⊢ (𝑥 ∈ (ℝ* ∖ {-∞}) ↔ (𝑥 ∈ ℝ* ∧ 𝑥 ≠ -∞)) | |
| 12 | eldifsn 4744 | . . . . 5 ⊢ (𝑦 ∈ (ℝ* ∖ {-∞}) ↔ (𝑦 ∈ ℝ* ∧ 𝑦 ≠ -∞)) | |
| 13 | xaddcl 13166 | . . . . . . 7 ⊢ ((𝑥 ∈ ℝ* ∧ 𝑦 ∈ ℝ*) → (𝑥 +𝑒 𝑦) ∈ ℝ*) | |
| 14 | 13 | ad2ant2r 748 | . . . . . 6 ⊢ (((𝑥 ∈ ℝ* ∧ 𝑥 ≠ -∞) ∧ (𝑦 ∈ ℝ* ∧ 𝑦 ≠ -∞)) → (𝑥 +𝑒 𝑦) ∈ ℝ*) |
| 15 | xaddnemnf 13163 | . . . . . 6 ⊢ (((𝑥 ∈ ℝ* ∧ 𝑥 ≠ -∞) ∧ (𝑦 ∈ ℝ* ∧ 𝑦 ≠ -∞)) → (𝑥 +𝑒 𝑦) ≠ -∞) | |
| 16 | eldifsn 4744 | . . . . . 6 ⊢ ((𝑥 +𝑒 𝑦) ∈ (ℝ* ∖ {-∞}) ↔ ((𝑥 +𝑒 𝑦) ∈ ℝ* ∧ (𝑥 +𝑒 𝑦) ≠ -∞)) | |
| 17 | 14, 15, 16 | sylanbrc 584 | . . . . 5 ⊢ (((𝑥 ∈ ℝ* ∧ 𝑥 ≠ -∞) ∧ (𝑦 ∈ ℝ* ∧ 𝑦 ≠ -∞)) → (𝑥 +𝑒 𝑦) ∈ (ℝ* ∖ {-∞})) |
| 18 | 11, 12, 17 | syl2anb 599 | . . . 4 ⊢ ((𝑥 ∈ (ℝ* ∖ {-∞}) ∧ 𝑦 ∈ (ℝ* ∖ {-∞})) → (𝑥 +𝑒 𝑦) ∈ (ℝ* ∖ {-∞})) |
| 19 | 18 | 3adant1 1131 | . . 3 ⊢ ((⊤ ∧ 𝑥 ∈ (ℝ* ∖ {-∞}) ∧ 𝑦 ∈ (ℝ* ∖ {-∞})) → (𝑥 +𝑒 𝑦) ∈ (ℝ* ∖ {-∞})) |
| 20 | eldifsn 4744 | . . . . 5 ⊢ (𝑧 ∈ (ℝ* ∖ {-∞}) ↔ (𝑧 ∈ ℝ* ∧ 𝑧 ≠ -∞)) | |
| 21 | xaddass 13176 | . . . . 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 1162 | . . . 4 ⊢ ((𝑥 ∈ (ℝ* ∖ {-∞}) ∧ 𝑦 ∈ (ℝ* ∖ {-∞}) ∧ 𝑧 ∈ (ℝ* ∖ {-∞})) → ((𝑥 +𝑒 𝑦) +𝑒 𝑧) = (𝑥 +𝑒 (𝑦 +𝑒 𝑧))) |
| 23 | 22 | adantl 481 | . . 3 ⊢ ((⊤ ∧ (𝑥 ∈ (ℝ* ∖ {-∞}) ∧ 𝑦 ∈ (ℝ* ∖ {-∞}) ∧ 𝑧 ∈ (ℝ* ∖ {-∞}))) → ((𝑥 +𝑒 𝑦) +𝑒 𝑧) = (𝑥 +𝑒 (𝑦 +𝑒 𝑧))) |
| 24 | 0re 11146 | . . . 4 ⊢ 0 ∈ ℝ | |
| 25 | rexr 11190 | . . . . 5 ⊢ (0 ∈ ℝ → 0 ∈ ℝ*) | |
| 26 | renemnf 11193 | . . . . 5 ⊢ (0 ∈ ℝ → 0 ≠ -∞) | |
| 27 | eldifsn 4744 | . . . . 5 ⊢ (0 ∈ (ℝ* ∖ {-∞}) ↔ (0 ∈ ℝ* ∧ 0 ≠ -∞)) | |
| 28 | 25, 26, 27 | sylanbrc 584 | . . . 4 ⊢ (0 ∈ ℝ → 0 ∈ (ℝ* ∖ {-∞})) |
| 29 | 24, 28 | mp1i 13 | . . 3 ⊢ (⊤ → 0 ∈ (ℝ* ∖ {-∞})) |
| 30 | eldifi 4085 | . . . . 5 ⊢ (𝑥 ∈ (ℝ* ∖ {-∞}) → 𝑥 ∈ ℝ*) | |
| 31 | 30 | adantl 481 | . . . 4 ⊢ ((⊤ ∧ 𝑥 ∈ (ℝ* ∖ {-∞})) → 𝑥 ∈ ℝ*) |
| 32 | xaddlid 13169 | . . . 4 ⊢ (𝑥 ∈ ℝ* → (0 +𝑒 𝑥) = 𝑥) | |
| 33 | 31, 32 | syl 17 | . . 3 ⊢ ((⊤ ∧ 𝑥 ∈ (ℝ* ∖ {-∞})) → (0 +𝑒 𝑥) = 𝑥) |
| 34 | 31 | xaddridd 13170 | . . 3 ⊢ ((⊤ ∧ 𝑥 ∈ (ℝ* ∖ {-∞})) → (𝑥 +𝑒 0) = 𝑥) |
| 35 | 5, 10, 19, 23, 29, 33, 34 | ismndd 18693 | . 2 ⊢ (⊤ → 𝑅 ∈ Mnd) |
| 36 | 35 | mptru 1549 | 1 ⊢ 𝑅 ∈ Mnd |
| Colors of variables: wff setvar class |
| Syntax hints: ∧ wa 395 ∧ w3a 1087 = wceq 1542 ⊤wtru 1543 ∈ wcel 2114 ≠ wne 2933 Vcvv 3442 ∖ cdif 3900 ⊆ wss 3903 {csn 4582 ‘cfv 6500 (class class class)co 7368 ℝcr 11037 0cc0 11038 -∞cmnf 11176 ℝ*cxr 11177 +𝑒 cxad 13036 Basecbs 17148 ↾s cress 17169 +gcplusg 17189 ℝ*𝑠cxrs 17433 Mndcmnd 18671 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5243 ax-nul 5253 ax-pow 5312 ax-pr 5379 ax-un 7690 ax-cnex 11094 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 ax-pre-mulgt0 11115 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-nel 3038 df-ral 3053 df-rex 3063 df-reu 3353 df-rab 3402 df-v 3444 df-sbc 3743 df-csb 3852 df-dif 3906 df-un 3908 df-in 3910 df-ss 3920 df-pss 3923 df-nul 4288 df-if 4482 df-pw 4558 df-sn 4583 df-pr 4585 df-tp 4587 df-op 4589 df-uni 4866 df-iun 4950 df-br 5101 df-opab 5163 df-mpt 5182 df-tr 5208 df-id 5527 df-eprel 5532 df-po 5540 df-so 5541 df-fr 5585 df-we 5587 df-xp 5638 df-rel 5639 df-cnv 5640 df-co 5641 df-dm 5642 df-rn 5643 df-res 5644 df-ima 5645 df-pred 6267 df-ord 6328 df-on 6329 df-lim 6330 df-suc 6331 df-iota 6456 df-fun 6502 df-fn 6503 df-f 6504 df-f1 6505 df-fo 6506 df-f1o 6507 df-fv 6508 df-riota 7325 df-ov 7371 df-oprab 7372 df-mpo 7373 df-om 7819 df-1st 7943 df-2nd 7944 df-frecs 8233 df-wrecs 8264 df-recs 8313 df-rdg 8351 df-1o 8407 df-er 8645 df-en 8896 df-dom 8897 df-sdom 8898 df-fin 8899 df-pnf 11180 df-mnf 11181 df-xr 11182 df-ltxr 11183 df-le 11184 df-sub 11378 df-neg 11379 df-nn 12158 df-2 12220 df-3 12221 df-4 12222 df-5 12223 df-6 12224 df-7 12225 df-8 12226 df-9 12227 df-n0 12414 df-z 12501 df-dec 12620 df-uz 12764 df-xadd 13039 df-fz 13436 df-struct 17086 df-sets 17103 df-slot 17121 df-ndx 17133 df-base 17149 df-ress 17170 df-plusg 17202 df-mulr 17203 df-tset 17208 df-ple 17209 df-ds 17211 df-xrs 17435 df-mgm 18577 df-sgrp 18656 df-mnd 18672 |
| This theorem is referenced by: xrs1cmn 21409 xrge0subm 21410 xrge00 33106 |
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