第三部分主要介绍不同的蕴涵理论，如实质蕴涵、严格蕴涵、相干蕴涵、反事实蕴涵和直觉主义蕴涵等。
The third part mainly introduces different implication theories, including: material implication, strict implication, relevant implication, counterfactual implication and intuitive implication.
第三部分主要介绍不同的蕴涵理论，如实质蕴涵、严格蕴涵、相干蕴涵、反事实蕴涵和直觉主义蕴涵等。
The third part mainly introduces different implication theories, including: material implication, strict implication, relevant implication, counterfactual implication and intuitive implication.
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