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12 Answers

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4	TRUE or FALSE: If R is a commutative ring with unity, then the set of units in R forms a subring
3	How do I prove the lattice theorem for rings?
3	Basic questions regarding matrix algebra.
3	Finding an isomorphism between $(U\otimes V)^{\mathsf T}$ and $B(U \times V,\mathbb{R})$
2	A subset of a metric space is closed iff its intersection with every compact subset is closed

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361 Reputation

+5	Coproduct in the category of (noncommutative) associative algebras
+10	Find a $1$-form whose exterior derivative is $2x^2y^2dydz +3xz^2dzdx - 4xy^2dxdy$
+10	How do I prove the lattice theorem for rings?
+15	How to show some sets are isomorphic?

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3 Questions

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4	Coproduct in the category of (noncommutative) associative algebras
3	Surjective graded homomorphism of rings also an isomorphism?
3	Vector orthogonal to null space is in row space (but over general field)

17 Tags

7 abstract-algebra × 4	3 transformation
6 linear-algebra × 5	3 matrices
6 homework × 3	3 graph-isomorphism
3 ring-theory × 3	2 real-analysis
3 metric-spaces	2 general-topology

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