Hidden or Suppressed Premises

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If there is any case in which true premises lead to a false conclusion, the argument is invalid. Therefore this argument is INVALID.

If there is any case in which true premises lead to a false conclusion, the argument is invalid. Therefore this argument is INVALID.

Presentation transcript:

Hidden or Suppressed Premises A premise which isn’t explicitly stated in the argument but which the argument actually relies on to connect the premises to the conclusion: P: that power station pollutes the environment (SP) Things that pollute should be shut down C: we should therefore, shut it down

The Importance of Hidden Premises P: homosexuality is unnatural (SP) things which are unnatural are wrong C: therefore, homosexuality is wrong

Validity - Structure The moon is made of cheese Cheese is made from milk So the moon is made from milk

All bankers are honest and hardworking Hardworking and honest people deserve bonuses So all bankers should receive bonuses The head of M&S is an intelligent person We should listen to intelligent people So we should listen to the head of M&S

Some popular people make good prime ministers Jeremy Clarkson is a popular person So Jeremy Clarkson should be prime minister