What's the plural form of propositional calculus? Here's the word you're looking for.
Answer
The noun propositional calculus can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be propositional calculus.
However, in more specific contexts, the plural form can also be propositional calculi e.g. in reference to various types of propositional calculi
or a collection of propositional calculi.
