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| Mirrors > Home > MPE Home > Th. List > risset | Structured version Visualization version GIF version | ||
| Description: Two ways to say "𝐴 belongs to 𝐵". (Contributed by NM, 22-Nov-1994.) |
| Ref | Expression |
|---|---|
| risset | ⊢ (𝐴 ∈ 𝐵 ↔ ∃𝑥 ∈ 𝐵 𝑥 = 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | exancom 1894 | . 2 ⊢ (∃𝑥(𝑥 ∈ 𝐵 ∧ 𝑥 = 𝐴) ↔ ∃𝑥(𝑥 = 𝐴 ∧ 𝑥 ∈ 𝐵)) | |
| 2 | df-rex 3092 | . 2 ⊢ (∃𝑥 ∈ 𝐵 𝑥 = 𝐴 ↔ ∃𝑥(𝑥 ∈ 𝐵 ∧ 𝑥 = 𝐴)) | |
| 3 | dfclel 2841 | . 2 ⊢ (𝐴 ∈ 𝐵 ↔ ∃𝑥(𝑥 = 𝐴 ∧ 𝑥 ∈ 𝐵)) | |
| 4 | 1, 2, 3 | 3bitr4ri 307 | 1 ⊢ (𝐴 ∈ 𝐵 ↔ ∃𝑥 ∈ 𝐵 𝑥 = 𝐴) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 ∧ wa 401 = wceq 1570 ∃wex 1812 ∈ wcel 2146 ∃wrex 3091 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2148 |
| This proof depends on definitions: df-bi 210 df-an 402 df-ex 1813 df-clel 2840 df-rex 3092 |
| This theorem is used by: nelb 3243 ceqsralv 3497 clel5 3626 reueq 3702 reuind 3718 0el 4318 reusv3 5378 elidinxp 6048 sucel 6441 fvmptt 7014 releldm2 8042 qsid 8781 ttrcltr 9688 zorng 10499 rereccl 11944 nndiv 12293 incexc2 15910 ruclem12 16314 chnfi 18707 conjnmzb 19346 pgpfac1lem2 20170 pgpfac1lem4 20173 mat1dimelbas 22657 mat1dimbas 22658 chmaidscmat 23034 unisngl 23713 fmid 24146 dcubic 27040 addsrid 28186 addsprop 28198 negsprop 28257 mulsrid 28335 mulsprop 28352 onsfi 28578 fusgrn0degnn0 29878 chscllem2 32019 disjunsn 32968 grplsm0l 33735 ballotlemsima 34930 dfon2lem8 36293 brimg 36440 dfrecs2 36455 altopelaltxp 36481 prtlem9 39671 prter2 39688 2llnmat 40331 2lnat 40591 cdlemefrs29bpre1 41204 elnn0rabdioph 43563 fiphp3d 43579 minregex 44293 |
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