README.md

TT638D Four Function Targeted Generalization

Goal: Fix TT638C dense failures before any dyadic/Mercy proof.

TT638C evidence:

• seen failed on uppercase canonical prompts for SUBTRACT, MULTIPLY, DIVIDE
• heldout failed on divide phrasing: Create divide so it computes a over b.

TT638D changes:

• balanced uppercase function-template coverage across ADD/SUBTRACT/MULTIPLY/DIVIDE
• explicit regression gate for TT638C failed prompts
• targeted divide a over b coverage
• fresh heldout prompts not used as train rows