He thought that logic is the science of necessary and valid inference rules.

他认为，逻辑是必然有效的推论规律的科学。

youdao

Though the association inference is relatively simple, it must observe some rules.

联言推理虽然比较简单，但亦有其内在的规律，也必须遵守一定的规则。

youdao

Though the association inference is relatively simple, it must observe some rules.

联言推理虽然比较简单，但亦有其内在的规律，也必须遵守一定的规则。

youdao