Vaisesika Sūtra 2.2.35

सम्प्रतिपत्तिभावाच्च ॥३५॥

sampratipattibhāvācca ॥35॥

[सम्-प्रतिपत्ति-भावात्-च (sam-pratipatti-bhāvāt-ca) - and due to the presence (bhāva) of mutual recognition or correspondence (sampratipatti);]

And due to the presence of mutual recognition (of identity or agreement).