直ちょく和わ集しゅう合ごう

ちょ

く

わ

しゅ

う

ご

う

Meanings

1

noun

direct sum (of sets)

mathematics

Mathematical term for the disjoint union of sets, often used in set theory and algebra.

直ちょく和わ
直和 (direct sum) is a broader algebraic concept; 直和集合 specifically refers to the direct sum of sets.
非ひ交こう和わ
非交和 (disjoint union) is a synonym often used in set theory; 直和集合 is more common in algebraic contexts.

Compound of 直 (direct) + 和 (sum) + 集合 (set), a calque of English 'direct sum of sets'.