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| Mirrors > Home > MPE Home > Th. List > eldifsnd | Structured version Visualization version GIF version | ||
| Description: Membership in a set with an element removed : deduction version. (Contributed by Thierry Arnoux, 4-May-2025.) |
| Ref | Expression |
|---|---|
| eldifsnd.1 | ⊢ (𝜑 → 𝐴 ∈ 𝐵) |
| eldifsnd.2 | ⊢ (𝜑 → 𝐴 ≠ 𝐶) |
| Ref | Expression |
|---|---|
| eldifsnd | ⊢ (𝜑 → 𝐴 ∈ (𝐵 ∖ {𝐶})) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | eldifsnd.1 | . 2 ⊢ (𝜑 → 𝐴 ∈ 𝐵) | |
| 2 | eldifsnd.2 | . 2 ⊢ (𝜑 → 𝐴 ≠ 𝐶) | |
| 3 | eldifsn 4748 | . 2 ⊢ (𝐴 ∈ (𝐵 ∖ {𝐶}) ↔ (𝐴 ∈ 𝐵 ∧ 𝐴 ≠ 𝐶)) | |
| 4 | 1, 2, 3 | sylanbrc 595 | 1 ⊢ (𝜑 → 𝐴 ∈ (𝐵 ∖ {𝐶})) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2145 ≠ wne 2955 ∖ cdif 3896 {csn 4584 |
| 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 2147 ax-9 2155 ax-ext 2732 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-ex 1813 df-sb 2100 df-clab 2739 df-cleq 2752 df-clel 2835 df-ne 2956 df-v 3452 df-dif 3902 df-sn 4585 |
| This theorem is used by: elpwdifsn 4752 prproe 4865 pfxchn 18699 chnind 18710 chnrev 18716 isdrng3lem1 20915 isdrng3lem2 20916 drngmcl 20919 r1pid2 26388 preimaaa 26556 angmgm 29277 dfprlng3 29306 irrednzr 33691 fracfld 33750 mxidlirredi 33875 rprmasso2 33937 rprmirredlem 33941 1arithidomlem1 33946 ufdprmidl 33952 1arithufdlem3 33957 1arithufdlem4 33958 dfufd2lem 33960 dfufd2 33961 zringfrac 33965 ply1dg1rt 33991 esplyind 34086 vietadeg1 34089 r1peuqusdeg1 36223 unitscyglem4 43065 resuppsinopn 43239 readvcot 43240 redivvald 43318 domnexpgn0cl 43406 drngmullcan 43408 drngmulrcan 43409 prjspvs 43457 sqrtnnaa 47732 sqrtnzqaa 47733 |
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