# math89

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 Jun12 awarded Teacher Apr13 asked a matrix problem Apr13 comment An irreducible polynomial question Is this logic correct? Apr13 comment An irreducible polynomial question I think it is $\big| F\big| ^{n-1}$. So $\frac{\mathbb F[x]}{}$ is a finite extension of $\mathbb F$ and thus it is algebraic. Apr13 asked continuous map question Apr13 asked An irreducible polynomial question Apr11 comment Order of an element in $U_n$ @ lab bhattacharjee its ok..:) Apr11 accepted Order of an element in $U_n$ Apr11 comment Order of an element in $U_n$ I think the last digit should be 2.Anyway nice answer. Apr11 comment A subgroup of order $6$ of $U_{700}$ @SeanEberhard, the elements 3 and 5 are of order 6 in $U_7$. Now what is the next step? Apr11 asked Order of an element in $U_n$ Apr10 asked A multiple choice question on factorising polynomial Apr10 comment A subgroup of order $6$ of $U_{700}$ I just now read the Carnichael function,I don't know enough of it.Now I think that all the elements i.e. {1,2,3,4,5,6} of $U_7$ are of order 6.So from this I guess that all the elements in $U_n$, in which case $U_n$ is cyclic, are of order $\lambda (n)$. and there is no element of order 6 in $U_4$ and $U_{25}$, as all the elements in $U_4$ and $U_{25}$ are of order 4 and 20 respectively.So after this how can I proceed? @ Sean Eberhard, Hans Engler Apr10 comment Centre of $GL_n(\mathbb R)$ sorry I don't know the other definition of centre. Apr10 asked Centre of $GL_n(\mathbb R)$ Apr10 awarded Commentator Apr10 comment What is the largest order of any element in $U_{900}$? How can you be sure about this? Actually I have wrong idea, so I want to clear it . Apr10 comment Subgroups of $A_5$ have order at most $12$? As far as I checked there is a product of 2-cycle and 3- cycles. But this product is not an even permutation. So if you please elaborate your point then it will be good for me. @ zach Apr10 comment A subgroup of order $6$ of $U_{700}$ I wanted to type those digits as suffixes but can't. Apr10 asked A subgroup of order $6$ of $U_{700}$