slides01-13

# R9 manc1czy v1 cz manczy r10 neither r5 nor r6 allows

This preview shows page 1. Sign up to view the full content.

This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: the form of the head of r4 . b Use manc1 in place of manc in the second subgoal. r7: mancX,Y :- v1 X,B & manc1X,B,Y r8: Use r5 for the m subgoal; uni cation of D and Y is necessary. r8: manc1C,Y,Y :- v1 C,Y r9: Similar to r8, but D uni ed with Z . r9: manc1C,Z,Y :- v1 C,Z & mancZ,Y r10: Neither r5 nor r6 allows uni cation with the m subgoal of r11 without introducing function symbols, so this rule cannot be used. r11: Same problem as r10. Summary of Rules r1: mancX,Y :- v2 X,Y r3: mancX,Y :- v2 X,Z & mancZ,Y r7: mancX,Y :- v1 X,B & manc1X,B,Y r8: manc1C,Y,Y :- v1 C,Y r9: manc1C,Z,Y :- v1 C,Z & mancZ,Y If we get rid of manc1 by expanding its subgoal in r7 in both possible ways, we get: mancX,Y :- v2 X,Y mancX,Y :- v2 X,Z & mancZ,Y mancX,Y :- v1 X,B & mancB,Y mancX,Y :- v1 X,Y That's beginning to make sense; it says that we can concatenate either of the views in any possible way, since each represents a chain ending in a female. But note that it doesn't get all maternal ancestors, e.g., my Father's Father's Mother. 5...
View Full Document

## This document was uploaded on 01/06/2012.

Ask a homework question - tutors are online