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Definition df-cls 20873
Description: Define a function on topologies whose value is the closure function on the subsets of the base set. See clsval 20889. (Contributed by NM, 3-Oct-2006.)
Assertion
Ref Expression
df-cls cls = (𝑗 ∈ Top ↦ (𝑥 ∈ 𝒫 𝑗 {𝑦 ∈ (Clsd‘𝑗) ∣ 𝑥𝑦}))
Distinct variable group:   𝑥,𝑗,𝑦

Detailed syntax breakdown of Definition df-cls
StepHypRef Expression
1 ccl 20870 . 2 class cls
2 vj . . 3 setvar 𝑗
3 ctop 20746 . . 3 class Top
4 vx . . . 4 setvar 𝑥
52cv 1522 . . . . . 6 class 𝑗
65cuni 4468 . . . . 5 class 𝑗
76cpw 4191 . . . 4 class 𝒫 𝑗
84cv 1522 . . . . . . 7 class 𝑥
9 vy . . . . . . . 8 setvar 𝑦
109cv 1522 . . . . . . 7 class 𝑦
118, 10wss 3607 . . . . . 6 wff 𝑥𝑦
12 ccld 20868 . . . . . . 7 class Clsd
135, 12cfv 5926 . . . . . 6 class (Clsd‘𝑗)
1411, 9, 13crab 2945 . . . . 5 class {𝑦 ∈ (Clsd‘𝑗) ∣ 𝑥𝑦}
1514cint 4507 . . . 4 class {𝑦 ∈ (Clsd‘𝑗) ∣ 𝑥𝑦}
164, 7, 15cmpt 4762 . . 3 class (𝑥 ∈ 𝒫 𝑗 {𝑦 ∈ (Clsd‘𝑗) ∣ 𝑥𝑦})
172, 3, 16cmpt 4762 . 2 class (𝑗 ∈ Top ↦ (𝑥 ∈ 𝒫 𝑗 {𝑦 ∈ (Clsd‘𝑗) ∣ 𝑥𝑦}))
181, 17wceq 1523 1 wff cls = (𝑗 ∈ Top ↦ (𝑥 ∈ 𝒫 𝑗 {𝑦 ∈ (Clsd‘𝑗) ∣ 𝑥𝑦}))
Colors of variables: wff setvar class
This definition is referenced by:  clsfval  20877
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