Max(A)

In checking theory of minimalism, Max(A) is the least full-category maximal projection dominating A.

Example
In (i), Max(X) = Max(H) = [XP1, XP2], i.e. the two-segment category XP.

(i)  XP1 /\     /  \     UP  XP2 /\      /  \     ZP1    X'    /\      /\ / \    /  \  WP  ZP2  X1  YP          /\ / \        H   X2

Link
Utrecht Lexicon of Linguistics