![]() |
Mathbox for Scott Fenton |
< Previous
Next >
Nearby theorems |
|
Mirrors > Home > MPE Home > Th. List > Mathboxes > fixssdm | Structured version Visualization version GIF version |
Description: The fixpoints of a class are a subset of its domain. (Contributed by Scott Fenton, 16-Apr-2012.) |
Ref | Expression |
---|---|
fixssdm | ⊢ Fix 𝐴 ⊆ dom 𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-fix 35825 | . 2 ⊢ Fix 𝐴 = dom (𝐴 ∩ I ) | |
2 | inss1 4258 | . . 3 ⊢ (𝐴 ∩ I ) ⊆ 𝐴 | |
3 | dmss 5927 | . . 3 ⊢ ((𝐴 ∩ I ) ⊆ 𝐴 → dom (𝐴 ∩ I ) ⊆ dom 𝐴) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ dom (𝐴 ∩ I ) ⊆ dom 𝐴 |
5 | 1, 4 | eqsstri 4043 | 1 ⊢ Fix 𝐴 ⊆ dom 𝐴 |
Colors of variables: wff setvar class |
Syntax hints: ∩ cin 3975 ⊆ wss 3976 I cid 5592 dom cdm 5700 Fix cfix 35801 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1793 ax-4 1807 ax-5 1909 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-ext 2711 |
This theorem depends on definitions: df-bi 207 df-an 396 df-or 847 df-3an 1089 df-tru 1540 df-fal 1550 df-ex 1778 df-sb 2065 df-clab 2718 df-cleq 2732 df-clel 2819 df-rab 3444 df-v 3490 df-dif 3979 df-un 3981 df-in 3983 df-ss 3993 df-nul 4353 df-if 4549 df-sn 4649 df-pr 4651 df-op 4655 df-br 5167 df-dm 5710 df-fix 35825 |
This theorem is referenced by: (None) |
Copyright terms: Public domain | W3C validator |