Three questions

In the SD
Hello Rabbi
Three unrelated questions: A. The rabbi often mentions Rabbi Shimon Shekap’s principle regarding “certainly doubtful” as is customary to say in yeshivas in the case of one who says, “One of your daughters is consecrated to me, but the child-births that were not given to the bridegroom, etc., are not given to the bridegroom, etc. Is it possible to say that this “ambiguous situation” is also equivalent to Rabbi Shimon’s definition of “from now on to the future” in terms of child-birth or divorce? B. What does the rabbi think of Husserl’s philosophy? I recently had the opportunity to look at it and it seems to me like a recycling of Descartes’ arguments with slight differences. C. Sorry for the nosyness, but which book of the rabbi does he define as the most important and significant to him? (I know that the immediate tendency is to say “they are all important,” and yet)
Thank you very much for taking the time.