Found:

Minimal residue

**SYNTAX: **Notion in **checking theory**. The minimal residue of X is the smallest subset K of the **residue**(X) S, such that for any element A of S, some element B of K reflexively dominates A.
** EXAMPLE:** In (i), the residue of X is ZP, UP, WP, H and whatever these categories dominate. The minimal residue of X is just {ZP, UP, WP, H}. The minimal residue of H is {UP, ZP, WP}.

(i) XP_{1}/\ / \ UP XP_{2}/\ / \ ZP_{1}X' /\ /\ / \ / \ WP ZP_{2}X_{1}YP /\ / \ H X_{2}

LIT. | Chomsky, N. (1995) Chomsky, N. (1993) |