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Mirrors > Home > MPE Home > Th. List > psseq1 | Structured version Visualization version GIF version |
Description: Equality theorem for proper subclass. (Contributed by NM, 7-Feb-1996.) |
Ref | Expression |
---|---|
psseq1 | ⊢ (𝐴 = 𝐵 → (𝐴 ⊊ 𝐶 ↔ 𝐵 ⊊ 𝐶)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseq1 3994 | . . 3 ⊢ (𝐴 = 𝐵 → (𝐴 ⊆ 𝐶 ↔ 𝐵 ⊆ 𝐶)) | |
2 | neeq1 3080 | . . 3 ⊢ (𝐴 = 𝐵 → (𝐴 ≠ 𝐶 ↔ 𝐵 ≠ 𝐶)) | |
3 | 1, 2 | anbi12d 632 | . 2 ⊢ (𝐴 = 𝐵 → ((𝐴 ⊆ 𝐶 ∧ 𝐴 ≠ 𝐶) ↔ (𝐵 ⊆ 𝐶 ∧ 𝐵 ≠ 𝐶))) |
4 | df-pss 3956 | . 2 ⊢ (𝐴 ⊊ 𝐶 ↔ (𝐴 ⊆ 𝐶 ∧ 𝐴 ≠ 𝐶)) | |
5 | df-pss 3956 | . 2 ⊢ (𝐵 ⊊ 𝐶 ↔ (𝐵 ⊆ 𝐶 ∧ 𝐵 ≠ 𝐶)) | |
6 | 3, 4, 5 | 3bitr4g 316 | 1 ⊢ (𝐴 = 𝐵 → (𝐴 ⊊ 𝐶 ↔ 𝐵 ⊊ 𝐶)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 208 ∧ wa 398 = wceq 1537 ≠ wne 3018 ⊆ wss 3938 ⊊ wpss 3939 |
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 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2802 df-cleq 2816 df-clel 2895 df-ne 3019 df-in 3945 df-ss 3954 df-pss 3956 |
This theorem is referenced by: psseq1i 4068 psseq1d 4071 psstr 4083 sspsstr 4084 brrpssg 7453 sorpssuni 7460 pssnn 8738 marypha1lem 8899 infeq5i 9101 infpss 9641 fin4i 9722 isfin2-2 9743 zornn0g 9929 ttukeylem7 9939 elnp 10411 elnpi 10412 ltprord 10454 pgpfac1lem1 19198 pgpfac1lem5 19203 pgpfac1 19204 pgpfaclem2 19206 pgpfac 19208 islbs3 19929 alexsubALTlem4 22660 wilthlem2 25648 spansncv 29432 cvbr 30061 cvcon3 30063 cvnbtwn 30065 dfon2lem3 33032 dfon2lem4 33033 dfon2lem5 33034 dfon2lem6 33035 dfon2lem7 33036 dfon2lem8 33037 dfon2 33039 lcvbr 36159 lcvnbtwn 36163 mapdcv 38798 |
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