In the history of philosophy & logic there is a taxonomy of syllogisms designated by name. William of Sherwood and Peter of Spain write of a mnemonic to help medieval students of logic memorize the syllogisms:

Barbara celarent darii ferio baralipton Celantes dabitis fapesmo frisesomorum; Cesare campestres festino baroco; darapti Felapton disamis datisi bocardo ferison.

Vowels & particular consonants have particular meaning.

  • a – universalis affirmativa (i.e. affirmo)
  • e – universalis negativa (i.e. nego)
  • i – particularis affirmativa (i.e. affirmo)
  • o – particularis negativa (i.e. nego)
  • s – conversio simplex.
  • p – conversio per accidens.
  • c – reductio ad contradictionem
  • m – metathesis (in Petrus Hispanus, conversio per contrapositionem?).
  • B – reductio ad Modus Barbara.
  • C – reductio ad Modus Celarent.
  • D – reductio ad Modus Darii.
  • F – reductio ad Modus Ferio.

Whom first devised the vowel-consonant designations in the taxonomy of syllogisms?

(A link to an article describing the context of logicians naming syllogisms mnemonically: https://plato.stanford.edu/entries/medieval-syllogism/)

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