graph TD 1["范畴论/范畴"] --> 0["范畴论/直和与直积"] classDef leaf fill:#fde68a,stroke:#b45309 class 0 leaf classDef root fill:#bfdbfe,stroke:#1d4ed8 class 1 root
graph TD 1["范畴论/范畴"] --> 0["范畴论/直和与直积"] classDef leaf fill:#fde68a,stroke:#b45309 class 0 leaf classDef root fill:#bfdbfe,stroke:#1d4ed8 class 1 root