Theorem clos1eq1 5874

Description: Equality law for closure. (Contributed by SF, 11-Feb-2015.)

Assertion

Ref	Expression
clos1eq1	|- (S = T -> Clos1 (S, R) = Clos1 (T, R))

Proof of Theorem clos1eq1

Dummy variable a is distinct from all other variables.

Step	Hyp	Ref	Expression
1		sseq1 3292	. . . . 5 |- (S = T -> (S C_ a <-> T C_ a))
2	1	anbi1d 685	. . . 4 |- (S = T -> ((S C_ a /\ (R"a) C_ a) <-> (T C_ a /\ (R"a) C_ a)))
3	2	abbidv 2467	. . 3 |- (S = T -> {a | (S C_ a /\ (R"a) C_ a)} = {a | (T C_ a /\ (R"a) C_ a)})
4		inteq 3929	. . 3 |- ({a | (S C_ a /\ (R"a) C_ a)} = {a | (T C_ a /\ (R"a) C_ a)} -> |^|{a | (S C_ a /\ (R"a) C_ a)} = |^|{a | (T C_ a /\ (R"a) C_ a)})
5	3, 4	syl 15	. 2 |- (S = T -> |^|{a | (S C_ a /\ (R"a) C_ a)} = |^|{a | (T C_ a /\ (R"a) C_ a)})
6		df-clos1 5873	. 2 |- Clos1 (S, R) = |^|{a | (S C_ a /\ (R"a) C_ a)}
7		df-clos1 5873	. 2 |- Clos1 (T, R) = |^|{a | (T C_ a /\ (R"a) C_ a)}
8	5, 6, 7	3eqtr4g 2410	1 |- (S = T -> Clos1 (S, R) = Clos1 (T, R))

Syntax hints:   -> wi 4   /\ wa 358   = wceq 1642  {cab 2339   C_ wss 3257  |^|cint 3926  "cima 4722   Clos1 cclos1 5872

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334

This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-ral 2619  df-v 2861  df-nin 3211  df-compl 3212  df-in 3213  df-ss 3259  df-int 3927  df-clos1 5873

This theorem is referenced by:  clos1exg  5877  clos1basesucg  5884  spacval  6282  nchoicelem11  6299  nchoicelem16  6304  freceq12  6311  frecxp  6314