graph TD
1["数理逻辑/一阶逻辑"] --> 0["数理逻辑/一阶逻辑演算"]
2["数理逻辑/命题逻辑演算"] --> 1["数理逻辑/一阶逻辑"]
3["数理逻辑/命题逻辑"] --> 2["数理逻辑/命题逻辑演算"]
4["朴素集合论/朴素集合论(代理)"] --> 3["数理逻辑/命题逻辑"]
classDef leaf fill:#fde68a,stroke:#b45309
class 0 leaf
classDef foundationRoot fill:#bbf7d0,stroke:#15803d
class 4 foundationRoot