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# 23 - 21:12 How is Medieval Logic different from Modern...

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21:12 How is Medieval Logic different from Modern Logic? Frege What is the Square supposed to do? If it is not true that everything is not an F then everything is an F If it is not true that there is something that is not an F then there is an F Rules for the interaction of negations and quantifiers What are Peters’ axioms (basic truths and rules of inference)? The law of contraries is this, that if one is true, the one remaining is false, and not conversely, for they can both be false at the same time when the matter is contingent, like ‘every man is white’ and ‘no man is white.’ Pg. 4 “14 The law of subcontraries is this, that if one is false, the one remaining is true, and not conversely, for they can both be true at the same time when the matter is contingent. Pg. 4 “14 The law of contradictories is this, that if one is true, the one remaining is false, and conversely, for they cannot be true or false at the same time with any matter. Pg. 4

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