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2.2.1 Direct sums and projections - MA20216: Algebra 2A

Then the sum \(\plst {V}1k\) is direct if and only if for each \(1\leq i\leq k\), \(V_i\cap (\sum _{j\neq i}V_j)=\set {0}\). Proof. This is an exercise in ...

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