Direct sum of vector spaces, symbol

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How do we denote the direct sum of non-orthogonal vector spaces? Is there a symbol for that?

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1 Answer

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If we have that $U,W$ are subspaces of a vector space $V$, such that:

$V = U + W$

$U \cap W = \{0\}$

we say that $V$ is the direct sum of its subspaces $U$ and $W$ and we denote this with $V = U \oplus W$

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