We may think of propositional modal logic as a system in between propositional logic and first-order predicate logic,

propositional modal logic命題模態(tài)邏輯

first order predicate logic一階謂詞邏輯

Lean’s logical foundation is a rich formalism called the calculus of inductive constructions, which supports dependent types.

literatuur

【軟件的數學根基】OPLSS: Software Foundations Lectures_嗶哩嗶哩_bilibili

Types and Terms

type theory（高階邏輯）

實驗環(huán)境

Visual Studio Code