Hal Jordan cannot use his ring on anything coloured yellow.
Some standard tennis balls are yellow.
Hal Jordan cannot use his ring on some standard tennis balls.
In this syllogism, the pattern of
A(Hal Jordan’s ring) cannot be(used on) B(anything yellow)
Some C(standard tennis balls) are B(yellow)
A(Hal Jordan’s ring) cannot be (used on) C( some tennis balls)
is followed, with A as the middle term, B as the predicate term, and C as the subject form. The logic is valid, and as wikipedia can show us,
proving the first premise as true, and
proving the second premise as true. As it is both valid and true, this is a sound syllogism.
….Also, after one post on why Stephen Downes is Batman, and another on the limitations of the Green Latern, I’m thinking that I like the whole superhero theme. The things you learn in logic.