Dualism
Dualism denotes a state of polar–opposites. For instance, positive vs. negative.
Some metaphysical, philosophical and religious systems incorporate dualism in their systems.
Good v. Evil
Dark v. Light
Love v. Hate
Mainstream Jewish philosophy does not give dualism significant attention. Remember that front and center, Judaism is projecting Monotheism: One God. Thus, any dualism in the cosmos would need to be a subordinate and lower tier dynamic.
However, the Garden of Eden saga, front and center in the Torah, has a significant undercurrent of Good v. Evil, as do other Torah sagas. Meaning, the Torah itself has key dualistic themes, although mainstream Jewish philosophy is overwhelmingly not so.
Kabbalah, the mystical philosophical offshoot of Judaism, does give significant play to dualism. [My own work, Summa Metaphysica, pegs–off of some Lurianic Kabbalistic motifs in this area, and incorporates some dualistic themes.]
