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Definition df-scott 43077
Description: Define the Scott operation. This operation constructs a subset of the input class which is nonempty whenever its input is using Scott's trick. (Contributed by Rohan Ridenour, 9-Aug-2023.)
Assertion
Ref Expression
df-scott Scott 𝐴 = {π‘₯ ∈ 𝐴 ∣ βˆ€π‘¦ ∈ 𝐴 (rankβ€˜π‘₯) βŠ† (rankβ€˜π‘¦)}
Distinct variable group:   π‘₯,𝑦,𝐴

Detailed syntax breakdown of Definition df-scott
StepHypRef Expression
1 cA . . 3 class 𝐴
21cscott 43076 . 2 class Scott 𝐴
3 vx . . . . . . 7 setvar π‘₯
43cv 1540 . . . . . 6 class π‘₯
5 crnk 9760 . . . . . 6 class rank
64, 5cfv 6543 . . . . 5 class (rankβ€˜π‘₯)
7 vy . . . . . . 7 setvar 𝑦
87cv 1540 . . . . . 6 class 𝑦
98, 5cfv 6543 . . . . 5 class (rankβ€˜π‘¦)
106, 9wss 3948 . . . 4 wff (rankβ€˜π‘₯) βŠ† (rankβ€˜π‘¦)
1110, 7, 1wral 3061 . . 3 wff βˆ€π‘¦ ∈ 𝐴 (rankβ€˜π‘₯) βŠ† (rankβ€˜π‘¦)
1211, 3, 1crab 3432 . 2 class {π‘₯ ∈ 𝐴 ∣ βˆ€π‘¦ ∈ 𝐴 (rankβ€˜π‘₯) βŠ† (rankβ€˜π‘¦)}
132, 12wceq 1541 1 wff Scott 𝐴 = {π‘₯ ∈ 𝐴 ∣ βˆ€π‘¦ ∈ 𝐴 (rankβ€˜π‘₯) βŠ† (rankβ€˜π‘¦)}
Colors of variables: wff setvar class
This definition is referenced by:  scotteqd  43078  nfscott  43080  scottabf  43081  scottss  43084  scottex2  43086  scotteld  43087  scottelrankd  43088
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