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This research aims to describe the ability of students’ mathematical proof in determining  the validity of argument reviewed from gender differences. The subjects of this research are one male and one female student of the fifth Semester, Mathematic Education in Majapahit Islamic University. Subjects are selected based on the heighest mathematics ability, it’s seen from previous assignments and tests. In addition, the comunication ability of the subjects is also considered in order to facilitate the researcher in conducting interviews. Based on the result of the tes with direct and indirect proof, it can be concluded that the subjects can mention all facts/premises and write about what should be shown (conclusion) in direct proof and write additional premis in indirect proff. Subjects can connect facts/premises to concepts which must be mastered. Subjects can use equivalent concept to manipulate and organize the proof. Subjects can use the concept of syllogism and tollens mode to obtain the desired conclusion. Subjects also construct mathematical evidence systematically, and logically. Subjects complement the reason for each step appropriately. The difference is that the male subject writes the final conclusion, while the female subject doesn’t write the final conclusion on the proof.

proof, mathematical, male, female