His mathematics was not rigorous (it could not be as the mathematical techniques necessary to make it so had not been developed e.g. measure theory and axiomatic probability) although, his results were basically correct.
Kanyang matematika ay hindi mahigpit na (ito ay hindi bilang ang matematika pamamaraan na kinakailangan upang gawin ito kaya ay hindi na binuo hal sukatin ang teorya at axiomatic probabilidad) bagaman, ang kanyang mga resulta ay basically tama.