Of great interest is Decker's research into cabala, the
dominant form of Jewish mysticism.
From the Cabala, the
[TEXT NOT REPRODUCIBLE IN ASCII.] migrated to mathematics: Georg Cantor's Mengenlehre, or set theory, chose the aleph to symbolize transfinite numbers exactly because it meant "infinity".
To provide an external standpoint from which to evaluate obscure statements in Cabala, the
author often invokes modern writers, such as Benjamin and Derrida, Freud and Jung, Bruno Schulz and Kafka.