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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 4751 | . 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 2957 ∖ cdif 3899 {csn 4587 |
| 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 2734 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-ex 1813 df-sb 2100 df-clab 2741 df-cleq 2754 df-clel 2837 df-ne 2958 df-v 3455 df-dif 3905 df-sn 4588 |
| This theorem is used by: elpwdifsn 4755 prproe 4868 pfxchn 18702 chnind 18713 chnrev 18719 isdrng3lem1 20915 isdrng3lem2 20916 drngmcl 20919 r1pid2 26389 dfprlng3 29291 irrednzr 33677 fracfld 33736 mxidlirredi 33861 rprmasso2 33923 rprmirredlem 33927 1arithidomlem1 33932 ufdprmidl 33938 1arithufdlem3 33943 1arithufdlem4 33944 dfufd2lem 33946 dfufd2 33947 zringfrac 33951 ply1dg1rt 33977 esplyind 34072 vietadeg1 34075 r1peuqusdeg1 36209 unitscyglem4 43051 resuppsinopn 43225 readvcot 43226 redivvald 43304 domnexpgn0cl 43392 drngmullcan 43394 drngmulrcan 43395 prjspvs 43443 sqrtnnaa 47718 sqrtnzqaa 47719 |
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