Combining Texts

You have chosen 'On the Principles of Indiscernibles' by Gottfried Leibniz, 'Probability and Logic of Rational Belief' by Henry E. Kyburg Jr and 'Super Epistolam Pauli Apostoli' by Thomas Aquinas

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All the ideas for Formal Logic, or select a subheading:
      A. Syllogistic Logic
      B. Propositional Logic PL
      C. Predicate Calculus PC
      D. Modal Logic ML
      E. Nonclassical Logics
      F. Set Theory ST
      G. Formal Mereology