פירוש על קידושין 38:13

The Talmud raises what seems to be a contradiction in the opinions of R. Meir. Above he implies that one can make a stipulation against that which is written in the Torah. But in the case of a husband who tries to stipulate with a woman that he will betroth her but not take on the responsibilities mandated by the Torah he rules that the stipulation is invalid. This seems clearly to be a contradiction.