Every position that is not intuitively true must be supported by an argument.
comprises two parts: reason and conclusion.
is the set of statements that claim to imply the position (or conclusion). Each such statement is called a premiss.
is the statement that the reason claims to support.
must pass two tests.
test is validity: the reason must imply only the conclusion.
test is truth: every premiss must be true.
We must accept
any argument that passes both tests.
that are not intuitively true must be separately supported by a branch argument.
can be rebutted on only two counts: invalidity (the reason does not imply only the conclusion) and non-truth (a premiss false
for an opposing conclusion (or a counterargument) is not a rebuttal.
argument (one with trunk and branches) is more easily attacked than a simple argument (trunk only).
is better supported by many trunks than by many branches.
To make a
case: One accepted argument.
a case: Rebut all arguments.