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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 3995 | . . 3 ⊢ (𝐴 = 𝐵 → (𝐴 ⊆ 𝐶 ↔ 𝐵 ⊆ 𝐶)) | |
2 | neeq1 3081 | . . 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 3957 | . 2 ⊢ (𝐴 ⊊ 𝐶 ↔ (𝐴 ⊆ 𝐶 ∧ 𝐴 ≠ 𝐶)) | |
5 | df-pss 3957 | . 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 1536 ≠ wne 3019 ⊆ wss 3939 ⊊ wpss 3940 |
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 1910 ax-6 1969 ax-7 2014 ax-8 2115 ax-9 2123 ax-10 2144 ax-11 2160 ax-12 2176 ax-ext 2796 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1539 df-ex 1780 df-nf 1784 df-sb 2069 df-clab 2803 df-cleq 2817 df-clel 2896 df-ne 3020 df-in 3946 df-ss 3955 df-pss 3957 |
This theorem is referenced by: psseq1i 4069 psseq1d 4072 psstr 4084 sspsstr 4085 brrpssg 7454 sorpssuni 7461 pssnn 8739 marypha1lem 8900 infeq5i 9102 infpss 9642 fin4i 9723 isfin2-2 9744 zornn0g 9930 ttukeylem7 9940 elnp 10412 elnpi 10413 ltprord 10455 pgpfac1lem1 19199 pgpfac1lem5 19204 pgpfac1 19205 pgpfaclem2 19207 pgpfac 19209 islbs3 19930 alexsubALTlem4 22661 wilthlem2 25649 spansncv 29433 cvbr 30062 cvcon3 30064 cvnbtwn 30066 dfon2lem3 33034 dfon2lem4 33035 dfon2lem5 33036 dfon2lem6 33037 dfon2lem7 33038 dfon2lem8 33039 dfon2 33041 lcvbr 36161 lcvnbtwn 36165 mapdcv 38800 |
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