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relativity
relative
facing (e.g. a problem); confronting
物理学では双対の概念が理論の発展に寄与した。
In physics, the concept of duality has contributed to the development of theory.
双対の関係にある二つの命題を比較した。
Two propositions in a dual relationship were compared.
数学における双対の原理を授業で学んだ。
I learned about the principle of duality in mathematics in class.