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Dec
30
comment Checking commutativity of a diagram of modules over some ring and what the commutativity of the diagram implies.
Thank you very much
Dec
30
accepted Checking commutativity of a diagram of modules over some ring and what the commutativity of the diagram implies.
Dec
30
comment Checking commutativity of a diagram of modules over some ring and what the commutativity of the diagram implies.
Thank you very much.
Dec
30
comment Checking commutativity of a diagram of modules over some ring and what the commutativity of the diagram implies.
Thanks to all of you.
Dec
29
comment Checking commutativity of a diagram of modules over some ring and what the commutativity of the diagram implies.
@Justpassingby: Do commutativity of the above diagram imply also that $sr=tu$? And if that is the case, why do authors check commutativity by considering only the squares as I did in part(1)?
Dec
29
comment Checking commutativity of a diagram of modules over some ring and what the commutativity of the diagram implies.
@Justaskin: Do commutativity of the above diagram imply also that $sr=tu$? And if that is the case, why do authors check commutativity by considering only the squares as I did in part(1) (See Gregory Grant answer)?
Dec
29
comment Checking commutativity of a diagram of modules over some ring and what the commutativity of the diagram implies.
@Justpassingby: what about part one of the question?
Dec
29
revised Checking commutativity of a diagram of modules over some ring and what the commutativity of the diagram implies.
edited title
Dec
29
comment Checking commutativity of a diagram of modules over some ring and what the commutativity of the diagram implies.
O.K. I will do that.
Dec
29
asked Checking commutativity of a diagram of modules over some ring and what the commutativity of the diagram implies.
Dec
27
comment Comodule induced from a comodule over a graded coalgebra
@darijgrinberg I posted an example in the question that may clarify things.
Dec
27
revised Comodule induced from a comodule over a graded coalgebra
added 374 characters in body
Dec
27
comment Comodule induced from a comodule over a graded coalgebra
@darijgrinberg it means that $m_{0} \in M^{\sigma \tau^{-1}}$. The paper is graded coalgebras (1993) by C. Nastasescu and B. Torrecillas proposition 3.4.
Dec
27
asked Comodule induced from a comodule over a graded coalgebra
Dec
22
awarded  Tumbleweed
Dec
16
revised Dual of a comodule is a comodule in case that is the module is finitely generated and projective
edited body
Dec
16
revised Dual of a comodule is a comodule in case that is the module is finitely generated and projective
deleted 14 characters in body
Dec
15
asked Dual of a comodule is a comodule in case that is the module is finitely generated and projective
Dec
10
revised Inverse of an isomorphism involving flat and finitely presented modules
edited tags
Dec
10
asked Inverse of an isomorphism involving flat and finitely presented modules