Update LeanCamCombi/ProbLYM.lean

Co-authored-by: Yaël Dillies <[email protected]>

Author: ctchou

LeanCamCombi/ProbLYM.lean

@@ -57,7 +57,7 @@ theorem card_numberingOn (s : Finset α) : card (NumberingOn s) = s.card.factori
 
 /-- `IsPrefix s f` means that the elements of `s` precede the elements of `sᶜ`
 in the numbering `f`. -/
-def IsPrefix (s : Finset α) (f : Numbering α) :=
+def Numbering IsPrefix (s : Finset α) (f : Numbering α) :=
   ∀ x, x ∈ s ↔ f x < s.card
 
 omit [DecidableEq α] in