Validity and Soundness (WritePhilosophy Guide)

We laid out two criteria for a persuasive argument: that the conclusion follows from the premises, and that the premises are all true. But what does it mean for a conclusion to “follow from” the premises? In deductive inference, we want to know whether an argument is valid and whether it is sound. What do these terms mean and how are they used?

Logical Equivalence (WritePhilosophy Guide)

What does it mean for two propositions to be logically equivalent? When can we swap out a proposition for another? Using the method of Truth Tables, we can formalise a way to discover whether two propositions are logically equivalent, and deploy this method to transform our claims into the most useful form to deploy them in arguments.