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Mirrors > Home > ILE Home > Th. List > sseqtrrd | GIF version |
Description: Substitution of equality into a subclass relationship. (Contributed by NM, 25-Apr-2004.) |
Ref | Expression |
---|---|
sseqtrrd.1 | ⊢ (𝜑 → 𝐴 ⊆ 𝐵) |
sseqtrrd.2 | ⊢ (𝜑 → 𝐶 = 𝐵) |
Ref | Expression |
---|---|
sseqtrrd | ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | sseqtrrd.1 | . 2 ⊢ (𝜑 → 𝐴 ⊆ 𝐵) | |
2 | sseqtrrd.2 | . . 3 ⊢ (𝜑 → 𝐶 = 𝐵) | |
3 | 2 | eqcomd 2146 | . 2 ⊢ (𝜑 → 𝐵 = 𝐶) |
4 | 1, 3 | sseqtrd 3140 | 1 ⊢ (𝜑 → 𝐴 ⊆ 𝐶) |
Colors of variables: wff set class |
Syntax hints: → wi 4 = wceq 1332 ⊆ wss 3076 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-5 1424 ax-7 1425 ax-gen 1426 ax-ie1 1470 ax-ie2 1471 ax-8 1483 ax-11 1485 ax-4 1488 ax-17 1507 ax-i9 1511 ax-ial 1515 ax-i5r 1516 ax-ext 2122 |
This theorem depends on definitions: df-bi 116 df-nf 1438 df-sb 1737 df-clab 2127 df-cleq 2133 df-clel 2136 df-in 3082 df-ss 3089 |
This theorem is referenced by: sseqtrrid 3153 fnfvima 5660 tfrlemiubacc 6235 tfr1onlemubacc 6251 tfrcllemubacc 6264 rdgivallem 6286 nnnninf 7031 dfphi2 11932 ctinf 11979 toponss 12232 ssntr 12330 iscnp3 12411 cnprcl2k 12414 tgcn 12416 tgcnp 12417 ssidcn 12418 cncnp 12438 txcnp 12479 imasnopn 12507 hmeontr 12521 blssec 12646 blssopn 12693 xmettx 12718 metcnp 12720 nnsf 13374 nninfsellemsuc 13383 |
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