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Mirrors > Home > MPE Home > Th. List > infm3lem | Structured version Visualization version GIF version |
Description: Lemma for infm3 11984. (Contributed by NM, 14-Jun-2005.) |
Ref | Expression |
---|---|
infm3lem | ⊢ (𝑥 ∈ ℝ → ∃𝑦 ∈ ℝ 𝑥 = -𝑦) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | renegcl 11334 | . 2 ⊢ (𝑥 ∈ ℝ → -𝑥 ∈ ℝ) | |
2 | recn 11011 | . . . 4 ⊢ (𝑥 ∈ ℝ → 𝑥 ∈ ℂ) | |
3 | 2 | negnegd 11373 | . . 3 ⊢ (𝑥 ∈ ℝ → --𝑥 = 𝑥) |
4 | 3 | eqcomd 2742 | . 2 ⊢ (𝑥 ∈ ℝ → 𝑥 = --𝑥) |
5 | negeq 11263 | . . 3 ⊢ (𝑦 = -𝑥 → -𝑦 = --𝑥) | |
6 | 5 | rspceeqv 3580 | . 2 ⊢ ((-𝑥 ∈ ℝ ∧ 𝑥 = --𝑥) → ∃𝑦 ∈ ℝ 𝑥 = -𝑦) |
7 | 1, 4, 6 | syl2anc 585 | 1 ⊢ (𝑥 ∈ ℝ → ∃𝑦 ∈ ℝ 𝑥 = -𝑦) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 = wceq 1539 ∈ wcel 2104 ∃wrex 3071 ℝcr 10920 -cneg 11256 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1911 ax-6 1969 ax-7 2009 ax-8 2106 ax-9 2114 ax-10 2135 ax-11 2152 ax-12 2169 ax-ext 2707 ax-sep 5232 ax-nul 5239 ax-pow 5297 ax-pr 5361 ax-un 7620 ax-resscn 10978 ax-1cn 10979 ax-icn 10980 ax-addcl 10981 ax-addrcl 10982 ax-mulcl 10983 ax-mulrcl 10984 ax-mulcom 10985 ax-addass 10986 ax-mulass 10987 ax-distr 10988 ax-i2m1 10989 ax-1ne0 10990 ax-1rid 10991 ax-rnegex 10992 ax-rrecex 10993 ax-cnre 10994 ax-pre-lttri 10995 ax-pre-lttrn 10996 ax-pre-ltadd 10997 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 846 df-3or 1088 df-3an 1089 df-tru 1542 df-fal 1552 df-ex 1780 df-nf 1784 df-sb 2066 df-mo 2538 df-eu 2567 df-clab 2714 df-cleq 2728 df-clel 2814 df-nfc 2887 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-reu 3305 df-rab 3306 df-v 3439 df-sbc 3722 df-csb 3838 df-dif 3895 df-un 3897 df-in 3899 df-ss 3909 df-nul 4263 df-if 4466 df-pw 4541 df-sn 4566 df-pr 4568 df-op 4572 df-uni 4845 df-br 5082 df-opab 5144 df-mpt 5165 df-id 5500 df-po 5514 df-so 5515 df-xp 5606 df-rel 5607 df-cnv 5608 df-co 5609 df-dm 5610 df-rn 5611 df-res 5612 df-ima 5613 df-iota 6410 df-fun 6460 df-fn 6461 df-f 6462 df-f1 6463 df-fo 6464 df-f1o 6465 df-fv 6466 df-riota 7264 df-ov 7310 df-oprab 7311 df-mpo 7312 df-er 8529 df-en 8765 df-dom 8766 df-sdom 8767 df-pnf 11061 df-mnf 11062 df-ltxr 11064 df-sub 11257 df-neg 11258 |
This theorem is referenced by: infm3 11984 reeff1o 25655 |
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