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The four relations between universals

al-nisab al-arbaʿ

النِّسَبُ الأَرْبَع

Any two universals stand in one of four relations: equivalence, general and particular absolutely, general and particular in some respect, or mutual exclusion.

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human= rationalEqualالتَّسَاوِيanimalhumanOne contains the otherالعُمُومُ المُطْلَقُwhiteanimalOverlappingالعُمُومُ مِنْ وَجْهٍhumanstoneMutually exclusiveالتَّبَايُنُ
Any two universals stand in one of four relations: equal, one containing the other, overlapping, or mutually exclusive.

Explanation

Equivalence (tasāwī): human and rational. General and particular absolutely: animal and human. In some respect: animal and white, which overlap in a white animal.

Mutual exclusion (tabāyun): human and stone, which never apply to the same thing.

Also written as: nisab arba, four relations.

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