Epistemology and Syllogism
The early Vaiśeṣika epistemology considered only pratyakṣa (perception) and anumāna (inference) as the pramāṇas (means of valid knowledge). The other two means of valid knowledge accepted by the Nyāya school, upamāna (comparison) and śabda (verbal testimony) were considered as included in anumāna. The syllogism of the Vaiśeṣika school was similar to that of the Nyāya, but the names given by Praśastapāda to the 5 members of syllogism are different.
Read more about this topic: Vaisheshika