Isomorphism

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39 Answers

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25
Prove that odd perfect square is congruent to $1$ modulo $8$
dec 31 at 23:51
8
Is $10^n+1$ composite for all $n\in \mathbb{N}$ greater then $2$?
dec 15 at 8:03
8
Show that $f(x)$ has no repeated roots.
dec 15 at 7:37
6
Solve $\sqrt[3]{x+10}-\sqrt[3]{x-10}=2$.
may 15 at 10:29
5
How to write in $2^x=5$ in logarithmic form?
may 18 at 10:53
3
Using induction to prove P(k) with P(k-1)
dec 18 at 5:45
3
Estimating $\pi$ very accurately
dec 15 at 23:46
3
Different equivalence relations of the set $\{a,b\}$
dec 15 at 18:13
3
Is $f:\mathbb Z \times \mathbb Z \to \mathbb Z$, $f(m,n)=31m+23n$ injective?
dec 15 at 11:08
3
How to prove this inequality $x,y\in\Bbb R$, $|x|<1,|y|<1$ show that $\bigg|\frac{x-y}{1-xy}\bigg| < 1$ (and similar ones)
nov 20 at 18:23
2
the highest common factor of $n-11$ and $3n+20$ is greater than 1?
jun 6 at 5:13
2
How do I evaluate the following expression?
may 19 at 17:07
2
Finding $A,B,C,D \subseteq \{1,2,…n\}$ such that $A \cup B \cup C \cup D = \{1,2,…,n\}$
may 15 at 11:09
2
$h\left(\frac{m}{2^n}\right)=0$ $\forall m\in\mathbb{Z},n\in\mathbb{N}$ implies $h(x)=0$ $\forall x\in\mathbb{R}$ if $h$ is continuous.
dec 17 at 20:36
2
how to find $|GL_2(F_p)|$
dec 16 at 13:58
2
Number of points on line segment
dec 15 at 19:10
2
A question on probability measures on uncountable spaces
dec 14 at 8:18
2
Karnaugh Map for an expression with two terms
sep 29 '11 at 19:05
1
Inequality for sums of reciprocals
jun 6 at 5:01
1
Why is this last step even necessary in this proof with open sets?
jan 1 at 5:00
1
Card probabilities
dec 19 at 19:52
1
Modular Quadratic Formula
dec 19 at 6:24
1
What is three different way to solve this probability / combinatorics problem of dice
dec 19 at 2:10
1
what's the algebra (if any) behind converting f(x) for a circle to a parametric equation
dec 17 at 10:54
1
Linear transformation
dec 17 at 10:27
1
The convergence of the sequence $x_{n+1}= \frac{n}{n+1} x_n$
dec 15 at 22:53
1
$\sup$ of set of limit points is in the set
dec 15 at 19:43
1
Proof of test of collinearity and coplanarity
dec 15 at 7:26
1
Jordan Canonical form of a matrix over rationals whose all entries are 1.
nov 26 at 7:00
0
Law of large numbers?
may 20 at 5:42
1 2