He discussed the philosophy of mathematics, political philosophy where topics such as censorship are discussed, and religious philosophy where topics such as atheism, dualism and pantheism are considered.
Tinalakay niya ang pilosopiya ng matematika, pampulitikang pilosopiya na kung saan ang mga paksa tulad ng censorship ay tinalakay, at relihiyon pilosopiya na kung saan ang mga paksa tulad ng Atheism, dualism at panteismo ay isinaalang-alang.