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May
11
awarded  Popular Question
May
7
awarded  Curious
May
7
awarded  Yearling
May
7
awarded  Notable Question
May
7
awarded  Commentator
May
7
awarded  Popular Question
May
7
awarded  Scholar
May
7
awarded  Supporter
May
7
awarded  Yearling
May
27
accepted What is convex combination of two points?
May
27
asked What is convex combination of two points?
May
27
accepted How to prove $G_2$ is a normal subgroup of $G_1\times G_2$?
May
26
comment To which group is the $\mathbb Z_{20}^*$ isomorphic?
Thank you all for the answers
May
26
accepted To which group is the $\mathbb Z_{20}^*$ isomorphic?
May
26
comment To which group is the $\mathbb Z_{20}^*$ isomorphic?
Thank you very much
May
26
comment To which group is the $\mathbb Z_{20}^*$ isomorphic?
Thank you, one more little question: how do we quickly decide that order of 3=4 eliminates z2xz2xz2? Why can't we have an element of order 4 in Z2xZ2xZ2?
May
26
comment To which group is the $\mathbb Z_{20}^*$ isomorphic?
That is also what i thought but here i am confused about why we are looking at modulo 20. YEs we have Z20* but it has 8 elements. So i wonder why we look at modulo 20 but not modulo 8?
May
26
comment To which group is the $\mathbb Z_{20}^*$ isomorphic?
well, i have some problems about checking the order of an element. For example, let us consider 3. What is its order? Should i look at it at modulo 20?
May
26
comment To which group is the $\mathbb Z_{20}^*$ isomorphic?
I thought about looking at those but i cannot decide whether it is an additive or multiplicative group. How can i decide it?
May
26
accepted What is the range of the following function?