police arrested a 28-year-old woman from the douglass houses, at 868 amsterdam ave. and west 103rd street, after she attacked her boyfriend with a knife. she told police on june 8 that her boyfriend knocked on her door at 9:43 p.m., but he refused to leave when asked. after he persisted, she allegedly cut him with a knife, leaving a laceration on his left ring finger. police believe the boyfriend is homeless. he was taken to st. luke's hospital for stitches and she was arrested for assault.