Explanation : Indian logic identifies six pramanas or
means of acquiring knowledge and
truth:
(i) pratyaksa, i.e., perception;
(ii) anumana, i.e., inference;
(iii) upamana, i.e. ,comparison and analogy;
(iv) arthapatti,i.e., postulation, implication, derivation from
circumstances;
(v) anupalabdhi , i.e., nonperception,
negative cognitive proof; and,
Sabda, i.e., word testimony.
Thus, derivation/
assumption/implication on the basis of two
apparently inconsistent perceived facts is
Arthapatti.