A – Sufficient
B – Necessary
· Knowing that I am eating is
sufficient for knowing that I am awake
· Being awake is necessary for
eating
“The
affluence of many of the September 11th hijackers cast doubt on the
notion that poverty was a necessary, let alone sufficient, condition for
suicidal terrorism.”
If
sufficient: If poor, then a suicidal
terrorist
If
necessary: If a suicidal terrorist, then poor
P1) No one has been able to
prove that children are not able to recall events prior to age 2.
C) Therefore, children are able to recall events prior to age 2
P1) A is a middle child
P2) Middle children can’t make up their own minds
C) Therefore, A’s homework is not worth the full 3 points.
P1) Only man is rational
P2) No woman is a man
C) No woman is rational
P1) Michael Moore is a
left-wing wacko
P2) Michael Moore gets rich
peddling cynicism to naïve people
C) Michael Moore’s claim that G.W. Bush is a deserter is false
P2) Think about the
countries in which people don’t have a choice about voting
C) Register to vote and vote.
P1) Everyone supports John
Kerry
C) John Kerry should be the next president of the U.S.
P1) The track coach is lazy and overweight
P2) The track coach lives an unhealthy lifestyle
C) The track coach cannot inform us of the positive benefits of
exercise.
P1) We have no proof that there is life beyond our planet
C) Therefore, there are no alien life forms on other planets
If
A, then B
A
Therefore,
B
If
A, then B
Not
B
Therefore,
not A
P1) If there is a God, then, given his benevolence,
this is the best of all possible worlds
P2) There is a benevolent God
C) Therefore, this is the best of all possible
worlds
P1) If there is a God, then, given his benevolence, this is the best of all possible worlds
P2) This is not the best of all possible world