New posts in Direct Sum

Is Hartshorne's Remark III.2.9.1 actually a valid argument?

Localization commutes with arbitrary direct sums

Uniqueness of the direct sum complement of a vector subspace

Cancellation Law for Direct Sums - What is wrong with this argument?

The definition of direct sums and subspaces?

Understanding the definition of the direct sum of subspaces of a vector space

If $\mathfrak{g}=\bigoplus\mathfrak{g}_i$ is a semisimple Lie algebra, why does $\mathfrak{h}=\bigoplus\left(\mathfrak{h}\cap\mathfrak{g}_i\right)$?

Difference between sum and direct sum

Prove that if $W_1\subseteq V$ finite-dimensional, then there is $W_2\subseteq V$ such that $V=W_1\oplus W_2$

Direct sums and direct products