When1: 1250
When2: 1270
Who: Peter of Spain or Petrus Hispanus Portugalensis [Portugalensis, Petrus Hispanus]
What: philosopher
Where: Spain
works\ Summary of Logic [1250 to 1270]
Detail: He lived 1215 to 1277 and became Pope John XXI. *Negation can apply to sentences with quantities. NOT every a is b, so Every a is NOT b {equipollence, Peter of Spain}. Different propositions have contexts that determine term references {supposition theory, Peter of Spain}.
Social Sciences>Philosophy>History>Epistemology
6-Philosophy-History-Epistemology
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Date Modified: 2022.0224