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Mar
28
suggested rejected edit on Proof that the tensor product is the coproduct in the category of R-algebras
Mar
27
revised List of common and uncommon categories
added 2 characters in body
Mar
27
revised List of common and uncommon categories
added 79 characters in body; deleted 1 character in body
Mar
27
asked List of common and uncommon categories
Mar
20
accepted Is there a continuous function from a 2-sphere into a circle?
Mar
20
comment Is there a continuous function from a 2-sphere into a circle?
$S^2\to D^2 \to I \to S^1$?
Mar
20
comment Is there a continuous function from a 2-sphere into a circle?
we suppose there is another map besides the trivial one, then they are homotopic. but we suppose the existence first, right
Mar
20
comment Is there a continuous function from a 2-sphere into a circle?
So how can I know the homotopy class is not only contain one element?
Mar
20
comment Is there a continuous function from a 2-sphere into a circle?
@MichaelAlbanese not specific type. I was wondering if there is only one or two such map so if it is not an odd map so I proved the corollary without reference the Borsuk-Ulam theorem.
Mar
20
comment Is there a continuous function from a 2-sphere into a circle?
@MichaelAlbanese yes, any other answer?
Mar
20
revised Is there a continuous function from a 2-sphere into a circle?
added 10 characters in body; edited body; added 2 characters in body
Mar
20
asked Is there a continuous function from a 2-sphere into a circle?
Mar
5
accepted free commutative graded algebra
Mar
5
revised free commutative graded algebra
deleted 1 character in body
Mar
5
revised free commutative graded algebra
added 8 characters in body; deleted 2 characters in body; added 2 characters in body; deleted 2 characters in body; added 2 characters in body
Mar
5
revised free commutative graded algebra
added 85 characters in body; deleted 12 characters in body; added 4 characters in body
Mar
5
asked free commutative graded algebra
Feb
29
revised Compact open topology
edited body; deleted 1 character in body; added 1 character in body
Feb
28
accepted Compact open topology
Feb
28
revised Compact open topology
added 1 character in body; added 1 character in body