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Definition df-topon 20523
 Description: Define the set of topologies with a given base set. (Contributed by Stefan O'Rear, 31-Jan-2015.)
Assertion
Ref Expression
df-topon TopOn = (𝑏 ∈ V ↦ {𝑗 ∈ Top ∣ 𝑏 = 𝑗})
Distinct variable group:   𝑗,𝑏

Detailed syntax breakdown of Definition df-topon
StepHypRef Expression
1 ctopon 20518 . 2 class TopOn
2 vb . . 3 setvar 𝑏
3 cvv 3173 . . 3 class V
42cv 1474 . . . . 5 class 𝑏
5 vj . . . . . . 7 setvar 𝑗
65cv 1474 . . . . . 6 class 𝑗
76cuni 4372 . . . . 5 class 𝑗
84, 7wceq 1475 . . . 4 wff 𝑏 = 𝑗
9 ctop 20517 . . . 4 class Top
108, 5, 9crab 2900 . . 3 class {𝑗 ∈ Top ∣ 𝑏 = 𝑗}
112, 3, 10cmpt 4643 . 2 class (𝑏 ∈ V ↦ {𝑗 ∈ Top ∣ 𝑏 = 𝑗})
121, 11wceq 1475 1 wff TopOn = (𝑏 ∈ V ↦ {𝑗 ∈ Top ∣ 𝑏 = 𝑗})
 Colors of variables: wff setvar class This definition is referenced by:  istopon  20540  bj-funtopon  32236  bj-toponss  32241  bj-dmtopon  32242
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