516 Why can ALL quadratic equations be solved by the quadratic formula? 494 Is the following matrix invertible? 229 Infiniteness of non-twin primes. 197 How I can prove that the sequence $\sqrt{2} , \sqrt{2\sqrt{2}}, \sqrt{2\sqrt{2\sqrt{2}}}$ converges to 2? 157 Can you raise a number to an irrational exponent?

### Reputation (477,056)

 +10 Combination of splitting elements into pairs +10 Is there an infinite number of primes constructed as in Euclid's proof? +10 Prove that $R$ is an integral domain $\Leftrightarrow$ $R[x]$ is an integral domain +10 The ring $\mathbb Z[\sqrt{-2}]= \{a+b\sqrt{-2} ; a\in \mathbb Z,b\in \mathbb Z \}$ has a Euclidean algorithm

### Questions (0)

This user has not asked any questions

### Tags (579)

 6k probability × 2684 3k real-analysis × 840 6k calculus × 1776 3k number-theory × 755 5k elementary-number-theory × 1096 3k sequences-and-series × 743 4k combinatorics × 1136 2k integration × 679 3k algebra-precalculus × 699 2k limits × 598

### Bookmarks (221)

 431 Best Sets of Lecture Notes and Articles 282 Why can ALL quadratic equations be solved by the quadratic formula? 60 Let $k$ be a natural number . Then $3k+1$ , $4k+1$ and $6k+1$ cannot all be square numbers. 46 Integral Contest 19 If every five point subset of a metric space can be isometrically embedded in the plane then is it possible for the metric space also?

### Accounts (7)

 Mathematics 477,056 rep 4040 gold badges488488 silver badges903903 bronze badges Mathematics Educators 181 rep 33 bronze badges Seasoned Advice 101 rep TeX - LaTeX 101 rep MathOverflow 101 rep