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Line 8:
Line 8: − − A lesser known rule is: − − #If Q is true, then R is true. − #R is not true. − #Therefore, Q is not true.
that was induction, not deduction.
#If A is true, then B is true.
#If A is true, then B is true.
#Therefore, B is true.
#Therefore, B is true.
Aristotle codified the rules of deduction two millenia ago in [[Ancient Greece]]. He also added 256 rules about groups of things. For example:
Aristotle codified the rules of deduction two millenia ago in [[Ancient Greece]]. He also added 256 rules about groups of things. For example: