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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 11442. (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 11370 | . . 3 ⊢ (𝑥 = 𝐴 → -𝑥 = -𝐴) | |
| 2 | 1 | eleq1d 2819 | . 2 ⊢ (𝑥 = 𝐴 → (-𝑥 ∈ ℝ ↔ -𝐴 ∈ ℝ)) |
| 3 | vex 3442 | . . . . . . 7 ⊢ 𝑥 ∈ V | |
| 4 | c0ex 11124 | . . . . . . 7 ⊢ 0 ∈ V | |
| 5 | 3, 4 | ifex 4528 | . . . . . 6 ⊢ if(𝑥 ∈ ℝ, 𝑥, 0) ∈ V |
| 6 | csbnegg 11375 | . . . . . 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 4384 | . . . . . . . . . . 11 ⊢ (0 ∈ V → ⦋0 / 𝑥⦌𝑥 = 0) | |
| 9 | 4, 8 | ax-mp 5 | . . . . . . . . . 10 ⊢ ⦋0 / 𝑥⦌𝑥 = 0 |
| 10 | 0re 11132 | . . . . . . . . . 10 ⊢ 0 ∈ ℝ | |
| 11 | 9, 10 | eqeltri 2830 | . . . . . . . . 9 ⊢ ⦋0 / 𝑥⦌𝑥 ∈ ℝ |
| 12 | sbcel1g 4366 | . . . . . . . . . 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 39160 | . . . . . . 7 ⊢ [if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥]𝑥 ∈ ℝ |
| 16 | sbcel1g 4366 | . . . . . . . 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 11440 | . . . . 5 ⊢ -⦋if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥⦌𝑥 ∈ ℝ |
| 20 | 7, 19 | eqeltri 2830 | . . . 4 ⊢ ⦋if(𝑥 ∈ ℝ, 𝑥, 0) / 𝑥⦌-𝑥 ∈ ℝ |
| 21 | sbcel1g 4366 | . . . . 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 39161 | . 2 ⊢ (𝑥 ∈ ℝ → -𝑥 ∈ ℝ) |
| 25 | 2, 24 | vtoclga 3530 | 1 ⊢ (𝐴 ∈ ℝ → -𝐴 ∈ ℝ) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 = wceq 1541 ∈ wcel 2113 Vcvv 3438 [wsbc 3738 ⦋csb 3847 ifcif 4477 ℝcr 11023 0cc0 11024 -cneg 11363 |
| 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 2115 ax-9 2123 ax-10 2146 ax-11 2162 ax-12 2182 ax-ext 2706 ax-sep 5239 ax-nul 5249 ax-pow 5308 ax-pr 5375 ax-un 7678 ax-resscn 11081 ax-1cn 11082 ax-icn 11083 ax-addcl 11084 ax-addrcl 11085 ax-mulcl 11086 ax-mulrcl 11087 ax-mulcom 11088 ax-addass 11089 ax-mulass 11090 ax-distr 11091 ax-i2m1 11092 ax-1ne0 11093 ax-1rid 11094 ax-rnegex 11095 ax-rrecex 11096 ax-cnre 11097 ax-pre-lttri 11098 ax-pre-lttrn 11099 ax-pre-ltadd 11100 |
| 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 2537 df-eu 2567 df-clab 2713 df-cleq 2726 df-clel 2809 df-nfc 2883 df-ne 2931 df-nel 3035 df-ral 3050 df-rex 3059 df-reu 3349 df-rab 3398 df-v 3440 df-sbc 3739 df-csb 3848 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4284 df-if 4478 df-pw 4554 df-sn 4579 df-pr 4581 df-op 4585 df-uni 4862 df-br 5097 df-opab 5159 df-mpt 5178 df-id 5517 df-po 5530 df-so 5531 df-xp 5628 df-rel 5629 df-cnv 5630 df-co 5631 df-dm 5632 df-rn 5633 df-res 5634 df-ima 5635 df-iota 6446 df-fun 6492 df-fn 6493 df-f 6494 df-f1 6495 df-fo 6496 df-f1o 6497 df-fv 6498 df-riota 7313 df-ov 7359 df-oprab 7360 df-mpo 7361 df-er 8633 df-en 8882 df-dom 8883 df-sdom 8884 df-pnf 11166 df-mnf 11167 df-ltxr 11169 df-sub 11364 df-neg 11365 |
| This theorem is referenced by: (None) |
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