The following terms typically, although not always (as Kant's synthetic apriori conceptual schemes show), refer to Rationalism and/or Innate Ideas.
A priori truths are known through reason and are justified independently of experience; they are known "sitting in your armchair". E.g. the cogito and "an object cannot be both green and red all over at the same time"
Analytic truths are known by analysing the terms involved, they are true by definition and are true in virture of the meaning of the terms employed. E.g. "All Bachelors are unmarried men"
Neccessary truths are where a denial of them will involve a self contradiction as they are possible in all worlds, the opposite of them is impossible. E.g. "It will snow or it will not snow"
Deductive Arguments are where the content of the conclusion is contained in the predicates of the argument. E.g. "Timmy is a cat. Cats are mammals. Therefore, Timmy is a mammal"
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