context: Chances are slight that Julius is a lion. Chances are about even that Brian is a swan. We doubt that Greg is a frog.
hypothesis: It is probable that brian is a swan, and Greg is a frog.
valid_hypothesis: There is little chance that brian is a swan, and Greg is a frog.
invalid_hypothesis: It is probable that brian is a swan, and Greg is a frog.
hypothesis_assertion: Brian is a swan, and Greg is a frog.