square of opposition
lessons 14-18
lessons 14-18
The relationship between A and O statements and I and E statements: they have opposite truth values
contradiction
the predicate of the conclusion, go to the conclusion, go to the end
major term
a syllogism written in categorical order with the terms replaced by abbreviations
schema
Rule #1 fill in the blank
in at least one premise, the middle term must be -
distributed
exists between the A and E statements. Both statements cannot be true, BUT, they can both be false
contrariety
a disagreement due to differing definitions for one or more words
verbal disagreement
three letter description of the types of categorical statements in a syllogism
mood
Rule #2 - fill in the blank
if a term is distributed in the conclusion,
it must also be distributed in its -
premise
exists between I and O statements. Both statements can be true, but they cannot both be false
sub-contrariety
the term that is shared in both premises
middle term
a number 1-4 identifying the placement of its middle term
figure
Rule #3 - fill in the blank
a valid syllogism cannot have two negative -
premises
Can only exist between A and I statements or E and O statements.
If A is true, then I is true. If E is true, then O is true.
sub-implication
identifies whether the statement is universal or particular
quantity
the mood and figure of a syllogism
form
Rule #4 fill in the blank
a valid syllogism cannot have a negative premise and an affirmative -
conclusion
Can only exist between I and A or O and E statements.
If I is false, then A is false. If A is false, then O is false.
super implication
identifies whether the statement is affirmative or negative
quality
invalid
Rule #5 fill in the blank
a valid syllogism cannot have two affirmative premises and a negative -
conclusion