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| Mirrors > Home > ILE Home > Th. List > negm | GIF version | ||
| Description: The image under negation of an inhabited set of reals is inhabited. (Contributed by Jim Kingdon, 10-Apr-2020.) |
| Ref | Expression |
|---|---|
| negm | ⊢ ((𝐴 ⊆ ℝ ∧ ∃𝑥 𝑥 ∈ 𝐴) → ∃𝑦 𝑦 ∈ {𝑧 ∈ ℝ ∣ -𝑧 ∈ 𝐴}) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ssel 3177 | . . . . 5 ⊢ (𝐴 ⊆ ℝ → (𝑥 ∈ 𝐴 → 𝑥 ∈ ℝ)) | |
| 2 | renegcl 8287 | . . . . . . . 8 ⊢ (𝑥 ∈ ℝ → -𝑥 ∈ ℝ) | |
| 3 | negeq 8219 | . . . . . . . . . 10 ⊢ (𝑧 = -𝑥 → -𝑧 = --𝑥) | |
| 4 | 3 | eleq1d 2265 | . . . . . . . . 9 ⊢ (𝑧 = -𝑥 → (-𝑧 ∈ 𝐴 ↔ --𝑥 ∈ 𝐴)) |
| 5 | 4 | elrab3 2921 | . . . . . . . 8 ⊢ (-𝑥 ∈ ℝ → (-𝑥 ∈ {𝑧 ∈ ℝ ∣ -𝑧 ∈ 𝐴} ↔ --𝑥 ∈ 𝐴)) |
| 6 | 2, 5 | syl 14 | . . . . . . 7 ⊢ (𝑥 ∈ ℝ → (-𝑥 ∈ {𝑧 ∈ ℝ ∣ -𝑧 ∈ 𝐴} ↔ --𝑥 ∈ 𝐴)) |
| 7 | recn 8012 | . . . . . . . . 9 ⊢ (𝑥 ∈ ℝ → 𝑥 ∈ ℂ) | |
| 8 | 7 | negnegd 8328 | . . . . . . . 8 ⊢ (𝑥 ∈ ℝ → --𝑥 = 𝑥) |
| 9 | 8 | eleq1d 2265 | . . . . . . 7 ⊢ (𝑥 ∈ ℝ → (--𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐴)) |
| 10 | 6, 9 | bitrd 188 | . . . . . 6 ⊢ (𝑥 ∈ ℝ → (-𝑥 ∈ {𝑧 ∈ ℝ ∣ -𝑧 ∈ 𝐴} ↔ 𝑥 ∈ 𝐴)) |
| 11 | 10 | biimprd 158 | . . . . 5 ⊢ (𝑥 ∈ ℝ → (𝑥 ∈ 𝐴 → -𝑥 ∈ {𝑧 ∈ ℝ ∣ -𝑧 ∈ 𝐴})) |
| 12 | 1, 11 | syli 37 | . . . 4 ⊢ (𝐴 ⊆ ℝ → (𝑥 ∈ 𝐴 → -𝑥 ∈ {𝑧 ∈ ℝ ∣ -𝑧 ∈ 𝐴})) |
| 13 | elex2 2779 | . . . 4 ⊢ (-𝑥 ∈ {𝑧 ∈ ℝ ∣ -𝑧 ∈ 𝐴} → ∃𝑦 𝑦 ∈ {𝑧 ∈ ℝ ∣ -𝑧 ∈ 𝐴}) | |
| 14 | 12, 13 | syl6 33 | . . 3 ⊢ (𝐴 ⊆ ℝ → (𝑥 ∈ 𝐴 → ∃𝑦 𝑦 ∈ {𝑧 ∈ ℝ ∣ -𝑧 ∈ 𝐴})) |
| 15 | 14 | exlimdv 1833 | . 2 ⊢ (𝐴 ⊆ ℝ → (∃𝑥 𝑥 ∈ 𝐴 → ∃𝑦 𝑦 ∈ {𝑧 ∈ ℝ ∣ -𝑧 ∈ 𝐴})) |
| 16 | 15 | imp 124 | 1 ⊢ ((𝐴 ⊆ ℝ ∧ ∃𝑥 𝑥 ∈ 𝐴) → ∃𝑦 𝑦 ∈ {𝑧 ∈ ℝ ∣ -𝑧 ∈ 𝐴}) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1364 ∃wex 1506 ∈ wcel 2167 {crab 2479 ⊆ wss 3157 ℝcr 7878 -cneg 8198 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 ax-io 710 ax-5 1461 ax-7 1462 ax-gen 1463 ax-ie1 1507 ax-ie2 1508 ax-8 1518 ax-10 1519 ax-11 1520 ax-i12 1521 ax-bndl 1523 ax-4 1524 ax-17 1540 ax-i9 1544 ax-ial 1548 ax-i5r 1549 ax-14 2170 ax-ext 2178 ax-sep 4151 ax-pow 4207 ax-pr 4242 ax-setind 4573 ax-resscn 7971 ax-1cn 7972 ax-icn 7974 ax-addcl 7975 ax-addrcl 7976 ax-mulcl 7977 ax-addcom 7979 ax-addass 7981 ax-distr 7983 ax-i2m1 7984 ax-0id 7987 ax-rnegex 7988 ax-cnre 7990 |
| This theorem depends on definitions: df-bi 117 df-3an 982 df-tru 1367 df-fal 1370 df-nf 1475 df-sb 1777 df-eu 2048 df-mo 2049 df-clab 2183 df-cleq 2189 df-clel 2192 df-nfc 2328 df-ne 2368 df-ral 2480 df-rex 2481 df-reu 2482 df-rab 2484 df-v 2765 df-sbc 2990 df-dif 3159 df-un 3161 df-in 3163 df-ss 3170 df-pw 3607 df-sn 3628 df-pr 3629 df-op 3631 df-uni 3840 df-br 4034 df-opab 4095 df-id 4328 df-xp 4669 df-rel 4670 df-cnv 4671 df-co 4672 df-dm 4673 df-iota 5219 df-fun 5260 df-fv 5266 df-riota 5877 df-ov 5925 df-oprab 5926 df-mpo 5927 df-sub 8199 df-neg 8200 |
| This theorem is referenced by: (None) |
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