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Jan 17, 2011
Undergraduate / Find X = solving of a problem --University of Chicago Supplement [4]
It is possible for an argument to have true premises,
yet have a false conclusion.
___
All salmon have one adipose fin above the tail.
The fish he caught has one adipose fin above the tail.
Therefore the fish is a salmon.
All S have F
T has F
Therefore T is S
All dogs have a heart
The animal he caught has a heart.
Therefore the animal is a dog.
Invalid.
As long as the original premise is true, so is the solution or conclusion.
It is possible for an argument to have true premises,
yet have a false conclusion.
___
His biology professor told him that all salmon have one adipose fin above the tail. The fish he caught has one adipose fin above the tail. Thus by using deductive reasoning, he can conclude that the fish is a salmon.
All salmon have one adipose fin above the tail.
The fish he caught has one adipose fin above the tail.
Therefore the fish is a salmon.
All S have F
T has F
Therefore T is S
All dogs have a heart
The animal he caught has a heart.
Therefore the animal is a dog.
Invalid.
