In formal logic, we develop different systems of symbols and rules to express ideas and carry out proofs. There are lots of such formal systems. In this module we discuss Sentential Logic (SL). It is one of the simplest formal systems of logic, and is also known as "Propositional Logic".
Before you begin, p check that your browser can display the logic symbols used in this module. These are the symbols:
≡ ∨ ↔ → ∃ ∀ ψ φ α β ⊧
They should look like the ones in this picture:
If not, try a more advanced browser, such as Chrome.
After you have finished this module, try our next module on predicate logic!