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2d
comment Is there official notation to represent “perform an operation n times”?
See math.stackexchange.com/questions/795334/….
2d
comment Why is so difficult to find beginner books in Algebraic Geometry
See math.stackexchange.com/questions/1748/….
2d
comment If $R[X]$ is ED then $R[X] $ is PID
A proof copied almost verbatim from the case $D=\mathbb Z$.
2d
comment Show that If $R[X]$ is Euclidean domain then $R$ is a field
@Sara, if you know that every ED is a PID, then yes. Otherwise, see my edited answer.
2d
revised Show that If $R[X]$ is Euclidean domain then $R$ is a field
added 293 characters in body
2d
revised Show that If $R[X]$ is Euclidean domain then $R$ is a field
added 5 characters in body
2d
answered Show that If $R[X]$ is Euclidean domain then $R$ is a field
2d
comment Show that If $R[X]$ is Euclidean domain then $R$ is a field
It is enough that $R[X]$ is a PID.
May
24
comment i have this gui calculator code. but i don't know how to make the arithmetic operation appear on textfield. can someone help me tnx .
Better suited to stackoverflow.com.
May
23
answered Divisibility of polynomials in a subfield of a field.
May
22
accepted If $G/Z(G)$ is cyclic then $G$ is abelian – what is the point?
May
21
answered What kind of set-theory is sufficient to understand mathematical analysis?(book recommendation))
May
21
answered Using induction to prove that $n^2 > n + 1$ for $n\geq2$
May
20
revised show that $\frac{1}{F_{1}}+\frac{2}{F_{2}}+\cdots+\frac{n}{F_{n}}<13$
deleted 6 characters in body
May
20
comment show that $\frac{1}{F_{1}}+\frac{2}{F_{2}}+\cdots+\frac{n}{F_{n}}<13$
I get $11.09$ instead of $11.08$ for your bound. The two numbers are actually the same.
May
20
revised show that $\frac{1}{F_{1}}+\frac{2}{F_{2}}+\cdots+\frac{n}{F_{n}}<13$
added 53 characters in body
May
20
awarded  Enlightened
May
20
comment What is the motivation for complex conjugation?
@quapka, yes, you have the right definition of $\mathbb R$-automorphism: a ring automorphism that fixes $\mathbb R$ pointwise.
May
20
comment What does $\mathbb{R} \setminus S$ mean?
@user36790, no problem.
May
20
comment What does $\mathbb{R} \setminus S$ mean?
@Bob1123, see also math.stackexchange.com/questions/114488/….