direct sum
Mathematics
noun
A set regarded formally as the sum of sets X 1,…,X n, consisting of ordered n-tuples (x 1,…,x n), where x i ∈ X i, and distinguished from a direct product only in the case of an infinite number of sets, the direct sum consisting only of sequences containing a finite number of non-zero elements.
Origin
Early 20th century; earliest use found in Proceedings of the London Mathematical Society.
- throw of the dice
- throw oneself at
- throw oneself into
- throw oneself on (or upon)
- throw oneself on someone's mercy
- throw one's hand in
- throw one's hat in (or into) the ring
- throw one's hat in the ring
- throw one's money about/around
- throw one's toys out of the pram
- throw one's weight about (or around)
- throw one's weight behind
- throw (or cast or shed) light on
- throw (or catch) someone off balance
- throw (or chuck)a seven
- throw (or knock) someone for a loop
- throw (or pour) cold water on
- throw-over
- throw people together
- throw pillow
- throw rug
- throw shade
- throw shapes
- throw someone a bone
- throw someone a curve