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seen Dec 13 '12 at 18:25

Dec
13
comment Is $\sup_n\sup_l a_{n,l} = \sup_l \sup_n a_{n,l}$? Prove or disprove.
i wrote something but i think the reasoning is not sound, can you help me with proving at least one inequality?
Dec
13
suggested rejected edit on Is $\sup_n\sup_l a_{n,l} = \sup_l \sup_n a_{n,l}$? Prove or disprove.
Dec
13
comment Is $\sup_n\sup_l a_{n,l} = \sup_l \sup_n a_{n,l}$? Prove or disprove.
which 'first' inequality are you talking about? also are you sure your subscripts are consistent with the question?
Dec
13
revised Is $\sup_n\sup_l a_{n,l} = \sup_l \sup_n a_{n,l}$? Prove or disprove.
added 5 characters in body
Dec
13
revised Is $\sup_n\sup_l a_{n,l} = \sup_l \sup_n a_{n,l}$? Prove or disprove.
added 18 characters in body; edited title
Dec
13
comment Is $\sup_n\sup_l a_{n,l} = \sup_l \sup_n a_{n,l}$? Prove or disprove.
ok i wrote it down.
Dec
13
revised Is $\sup_n\sup_l a_{n,l} = \sup_l \sup_n a_{n,l}$? Prove or disprove.
added 426 characters in body
Dec
13
comment Is $\sup_n\sup_l a_{n,l} = \sup_l \sup_n a_{n,l}$? Prove or disprove.
I have already, i am just too lazy to write it down.
Dec
13
asked Is $\sup_n\sup_l a_{n,l} = \sup_l \sup_n a_{n,l}$? Prove or disprove.
Dec
13
accepted Prove that the set of all indirect isometries (reflections and glide reflections) is not a group.
Dec
13
awarded  Commentator
Dec
13
comment Prove that the set of all indirect isometries (reflections and glide reflections) is not a group.
i guess you are saying that two reflections make a rotation/translation and since they are not in the group its not closed under composition. Is that what you are suggesting?
Dec
13
asked Prove that the set of all indirect isometries (reflections and glide reflections) is not a group.
Dec
12
comment What kind of isometry is a composition of a glide reflection with itself? Justify
great i see now, thanks!
Dec
12
accepted What kind of isometry is a composition of a glide reflection with itself? Justify
Dec
12
comment What kind of isometry is a composition of a glide reflection with itself? Justify
this is more or less correct if I understand your idea correctly(unless you missed the word 'GLIDE REFLECTION') but I need to prove that composition of glide reflection with itself is a translation NOT that two reflections make a translation (that is indeed a very basic result)
Dec
12
comment What kind of isometry is a composition of a glide reflection with itself? Justify
yeah i checked geometrically, i am trying to solve it algebraically as well by using the fact that Mk composed with Tab = Tab composed with Mk where AB is parallel to the line of reflection k. Tab is a translation and Mk is a reflection across line k AND Mk composed with Tab is glide reflection.
Dec
12
asked What kind of isometry is a composition of a glide reflection with itself? Justify
Dec
12
awarded  Scholar
Dec
12
comment Construct two chords of equal length through points A and B (two arbitrary points INSIDE a circle) that are perpendicular to each other.
Thanks! I really appreciate it, helped a lot!