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| Mirrors > Home > MPE Home > Th. List > Mathboxes > renegclALT | Structured version Visualization version GIF version | ||
| Description: Closure law for negative of reals. Demonstrates use of weak deduction theorem with explicit substitution. The proof is much longer than that of renegcl 11424. (Contributed by NM, 15-Jun-2019.) (Proof modification is discouraged.) (New usage is discouraged.) |
| Ref | Expression |
|---|---|
| renegclALT | ⊢ (𝐴 ∈ ℝ → -𝐴 ∈ ℝ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | negeq 11352 | . . 3 ⊢ (𝑥 = 𝐴 → -𝑥 = -𝐴) | |
| 2 | 1 | eleq1d 2816 | . 2 ⊢ (𝑥 = 𝐴 → (-𝑥 ∈ ℝ ↔ -𝐴 ∈ ℝ)) |
| 3 | vex 3440 | . . . . . . 7 ⊢ 𝑥 ∈ V | |
| 4 | c0ex 11106 | . . . . . . 7 ⊢ 0 ∈ V | |
| 5 | 3, 4 | ifex 4523 | . . . . . 6 ⊢ if(𝑥 ∈ ℝ, 𝑥, 0) ∈ V |
| 6 | csbnegg 11357 | . . . . . 6 ⊢ (if(𝑥 ∈ ℝ, 𝑥, 0) ∈ V → ⦋if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥⦌-𝑥 = -⦋if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥⦌𝑥) | |
| 7 | 5, 6 | ax-mp 5 | . . . . 5 ⊢ ⦋if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥⦌-𝑥 = -⦋if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥⦌𝑥 |
| 8 | csbvarg 4381 | . . . . . . . . . . 11 ⊢ (0 ∈ V → ⦋0 / 𝑥⦌𝑥 = 0) | |
| 9 | 4, 8 | ax-mp 5 | . . . . . . . . . 10 ⊢ ⦋0 / 𝑥⦌𝑥 = 0 |
| 10 | 0re 11114 | . . . . . . . . . 10 ⊢ 0 ∈ ℝ | |
| 11 | 9, 10 | eqeltri 2827 | . . . . . . . . 9 ⊢ ⦋0 / 𝑥⦌𝑥 ∈ ℝ |
| 12 | sbcel1g 4363 | . . . . . . . . . 10 ⊢ (0 ∈ V → ([0 / 𝑥]𝑥 ∈ ℝ ↔ ⦋0 / 𝑥⦌𝑥 ∈ ℝ)) | |
| 13 | 4, 12 | ax-mp 5 | . . . . . . . . 9 ⊢ ([0 / 𝑥]𝑥 ∈ ℝ ↔ ⦋0 / 𝑥⦌𝑥 ∈ ℝ) |
| 14 | 11, 13 | mpbir 231 | . . . . . . . 8 ⊢ [0 / 𝑥]𝑥 ∈ ℝ |
| 15 | 14 | elimhyps 39008 | . . . . . . 7 ⊢ [if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥]𝑥 ∈ ℝ |
| 16 | sbcel1g 4363 | . . . . . . . 8 ⊢ (if(𝑥 ∈ ℝ, 𝑥, 0) ∈ V → ([if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥]𝑥 ∈ ℝ ↔ ⦋if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥⦌𝑥 ∈ ℝ)) | |
| 17 | 5, 16 | ax-mp 5 | . . . . . . 7 ⊢ ([if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥]𝑥 ∈ ℝ ↔ ⦋if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥⦌𝑥 ∈ ℝ) |
| 18 | 15, 17 | mpbi 230 | . . . . . 6 ⊢ ⦋if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥⦌𝑥 ∈ ℝ |
| 19 | 18 | renegcli 11422 | . . . . 5 ⊢ -⦋if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥⦌𝑥 ∈ ℝ |
| 20 | 7, 19 | eqeltri 2827 | . . . 4 ⊢ ⦋if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥⦌-𝑥 ∈ ℝ |
| 21 | sbcel1g 4363 | . . . . 5 ⊢ (if(𝑥 ∈ ℝ, 𝑥, 0) ∈ V → ([if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥]-𝑥 ∈ ℝ ↔ ⦋if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥⦌-𝑥 ∈ ℝ)) | |
| 22 | 5, 21 | ax-mp 5 | . . . 4 ⊢ ([if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥]-𝑥 ∈ ℝ ↔ ⦋if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥⦌-𝑥 ∈ ℝ) |
| 23 | 20, 22 | mpbir 231 | . . 3 ⊢ [if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥]-𝑥 ∈ ℝ |
| 24 | 23 | dedths 39009 | . 2 ⊢ (𝑥 ∈ ℝ → -𝑥 ∈ ℝ) |
| 25 | 2, 24 | vtoclga 3528 | 1 ⊢ (𝐴 ∈ ℝ → -𝐴 ∈ ℝ) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 = wceq 1541 ∈ wcel 2111 Vcvv 3436 [wsbc 3736 ⦋csb 3845 ifcif 4472 ℝcr 11005 0cc0 11006 -cneg 11345 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-sep 5232 ax-nul 5242 ax-pow 5301 ax-pr 5368 ax-un 7668 ax-resscn 11063 ax-1cn 11064 ax-icn 11065 ax-addcl 11066 ax-addrcl 11067 ax-mulcl 11068 ax-mulrcl 11069 ax-mulcom 11070 ax-addass 11071 ax-mulass 11072 ax-distr 11073 ax-i2m1 11074 ax-1ne0 11075 ax-1rid 11076 ax-rnegex 11077 ax-rrecex 11078 ax-cnre 11079 ax-pre-lttri 11080 ax-pre-lttrn 11081 ax-pre-ltadd 11082 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3737 df-csb 3846 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-nul 4281 df-if 4473 df-pw 4549 df-sn 4574 df-pr 4576 df-op 4580 df-uni 4857 df-br 5090 df-opab 5152 df-mpt 5171 df-id 5509 df-po 5522 df-so 5523 df-xp 5620 df-rel 5621 df-cnv 5622 df-co 5623 df-dm 5624 df-rn 5625 df-res 5626 df-ima 5627 df-iota 6437 df-fun 6483 df-fn 6484 df-f 6485 df-f1 6486 df-fo 6487 df-f1o 6488 df-fv 6489 df-riota 7303 df-ov 7349 df-oprab 7350 df-mpo 7351 df-er 8622 df-en 8870 df-dom 8871 df-sdom 8872 df-pnf 11148 df-mnf 11149 df-ltxr 11151 df-sub 11346 df-neg 11347 |
| This theorem is referenced by: (None) |
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