### Answers (766)

 47 Let $f(x)=x^2+12x+30$. Solve $f(f(f(f(f(x)))))=0$ 27 Why can't you prove the law of the excluded middle in intuitionistic logic (for layman)? 26 Three variable, second-degree symmetric Diophantine equation 24 $\sqrt{12} +\sqrt{31}$ is irrational 22 Ring of the integer $p$-adic numbers $\mathbb{Z}_p$

### Reputation (27,751)

 +10 What do groups and rings “look like”? +10 What are the most obscure or advanced mathematics with practical application +10 Interesting identity $\sum_{A\subseteq X\\B\subseteq X}|A\cap B|=n4^{n-1}$ +10 Lawvere: Recovering Galois connections from “globalized” Galois connections (adjunctions)

### Questions (11)

 15 Examples of rings whose polynomial rings have large dimension 5 “Localizing” commutative pointed monoids 4 Is the long line completely uniformizable? 3 Lifting Functors to Adjoints 3 General facts about locally Hausdorff spaces?

### Tags (262)

 662 abstract-algebra × 246 169 polynomials × 50 285 ring-theory × 98 157 elementary-number-theory × 46 215 algebraic-geometry × 84 135 number-theory × 47 179 group-theory × 64 127 field-theory × 47 170 commutative-algebra × 66 123 general-topology × 47

### Bookmarks (372)

 138 Does every ring of integers sit inside a ring of integers that has a power basis? 121 Is There An Injective Cubic Polynomial $\mathbb Z^2 \rightarrow \mathbb Z$? 44 Only 12 polynomials exist with given properties 42 What is $\cdots ((((1/2)/(3/4))/((5/6)/(7/8)))/(((9/10)/(11/12))/((13/14)/(15/16))))/\cdots$? [duplicate] 34 Is there a function whose inverse is exactly the reciprocal of the function, that is $f^{-1} = \frac{1}{f}$?

### Account (1)

 Mathematics 27,751 rep 11 gold badge3030 silver badges7474 bronze badges

### Badges (47)

 soft-question Good Answer × 3 Informed Announcer Nice Answer × 33 Enlightened × 11 Caucus × 2 Necromancer Yearling × 8 field-theory

### Active bounties (0)

This user has no active bounties

### Votes cast (504)

all time   by type
454 up 244 question
50 down 260 answer