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Mirrors > Home > ILE Home > Th. List > negexsr | GIF version |
Description: Existence of negative signed real. Part of Proposition 9-4.3 of [Gleason] p. 126. (Contributed by NM, 2-May-1996.) |
Ref | Expression |
---|---|
negexsr | ⊢ (𝐴 ∈ R → ∃𝑥 ∈ R (𝐴 +R 𝑥) = 0R) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | m1r 7528 | . . 3 ⊢ -1R ∈ R | |
2 | mulclsr 7530 | . . 3 ⊢ ((𝐴 ∈ R ∧ -1R ∈ R) → (𝐴 ·R -1R) ∈ R) | |
3 | 1, 2 | mpan2 421 | . 2 ⊢ (𝐴 ∈ R → (𝐴 ·R -1R) ∈ R) |
4 | pn0sr 7547 | . 2 ⊢ (𝐴 ∈ R → (𝐴 +R (𝐴 ·R -1R)) = 0R) | |
5 | oveq2 5750 | . . . 4 ⊢ (𝑥 = (𝐴 ·R -1R) → (𝐴 +R 𝑥) = (𝐴 +R (𝐴 ·R -1R))) | |
6 | 5 | eqeq1d 2126 | . . 3 ⊢ (𝑥 = (𝐴 ·R -1R) → ((𝐴 +R 𝑥) = 0R ↔ (𝐴 +R (𝐴 ·R -1R)) = 0R)) |
7 | 6 | rspcev 2763 | . 2 ⊢ (((𝐴 ·R -1R) ∈ R ∧ (𝐴 +R (𝐴 ·R -1R)) = 0R) → ∃𝑥 ∈ R (𝐴 +R 𝑥) = 0R) |
8 | 3, 4, 7 | syl2anc 408 | 1 ⊢ (𝐴 ∈ R → ∃𝑥 ∈ R (𝐴 +R 𝑥) = 0R) |
Colors of variables: wff set class |
Syntax hints: → wi 4 = wceq 1316 ∈ wcel 1465 ∃wrex 2394 (class class class)co 5742 Rcnr 7073 0Rc0r 7074 -1Rcm1r 7076 +R cplr 7077 ·R cmr 7078 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-in1 588 ax-in2 589 ax-io 683 ax-5 1408 ax-7 1409 ax-gen 1410 ax-ie1 1454 ax-ie2 1455 ax-8 1467 ax-10 1468 ax-11 1469 ax-i12 1470 ax-bndl 1471 ax-4 1472 ax-13 1476 ax-14 1477 ax-17 1491 ax-i9 1495 ax-ial 1499 ax-i5r 1500 ax-ext 2099 ax-coll 4013 ax-sep 4016 ax-nul 4024 ax-pow 4068 ax-pr 4101 ax-un 4325 ax-setind 4422 ax-iinf 4472 |
This theorem depends on definitions: df-bi 116 df-dc 805 df-3or 948 df-3an 949 df-tru 1319 df-fal 1322 df-nf 1422 df-sb 1721 df-eu 1980 df-mo 1981 df-clab 2104 df-cleq 2110 df-clel 2113 df-nfc 2247 df-ne 2286 df-ral 2398 df-rex 2399 df-reu 2400 df-rab 2402 df-v 2662 df-sbc 2883 df-csb 2976 df-dif 3043 df-un 3045 df-in 3047 df-ss 3054 df-nul 3334 df-pw 3482 df-sn 3503 df-pr 3504 df-op 3506 df-uni 3707 df-int 3742 df-iun 3785 df-br 3900 df-opab 3960 df-mpt 3961 df-tr 3997 df-eprel 4181 df-id 4185 df-po 4188 df-iso 4189 df-iord 4258 df-on 4260 df-suc 4263 df-iom 4475 df-xp 4515 df-rel 4516 df-cnv 4517 df-co 4518 df-dm 4519 df-rn 4520 df-res 4521 df-ima 4522 df-iota 5058 df-fun 5095 df-fn 5096 df-f 5097 df-f1 5098 df-fo 5099 df-f1o 5100 df-fv 5101 df-ov 5745 df-oprab 5746 df-mpo 5747 df-1st 6006 df-2nd 6007 df-recs 6170 df-irdg 6235 df-1o 6281 df-2o 6282 df-oadd 6285 df-omul 6286 df-er 6397 df-ec 6399 df-qs 6403 df-ni 7080 df-pli 7081 df-mi 7082 df-lti 7083 df-plpq 7120 df-mpq 7121 df-enq 7123 df-nqqs 7124 df-plqqs 7125 df-mqqs 7126 df-1nqqs 7127 df-rq 7128 df-ltnqqs 7129 df-enq0 7200 df-nq0 7201 df-0nq0 7202 df-plq0 7203 df-mq0 7204 df-inp 7242 df-i1p 7243 df-iplp 7244 df-imp 7245 df-enr 7502 df-nr 7503 df-plr 7504 df-mr 7505 df-0r 7507 df-1r 7508 df-m1r 7509 |
This theorem is referenced by: (None) |
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