Abstract:

FENG Qi claims that any concept has a dual function of describing and prescribing reality, and that those basic logical rules embody a unity of a posteriority and a priority.Considering the problem of the justification of logical theory, FENG's such a theory requires that the construction of a logical theory adhere to the unity of a posteriority and a priority.The justification of the argument theory in modern logic takes a more universalistic and a prior approach; however, informal logic tries to justify itself from the perspective of a unity of a posteriority and a priority, and of universality and contextuality.

Key words: FENG Qi, dual function of concept, logical theory, justification