User Snowball

20 votes

5 answers

2k views

Has error correction been "solved"?

asked Oct 17, 2012 at 22:15

15 votes

2 answers

8k views

Kernel of composition of linear transformations

linear-algebra

asked Sep 26, 2012 at 9:03

14 votes

5 answers

2k views

What does $\binom{-n}{k}$ mean?

combinatorics

asked Oct 20, 2012 at 21:44

12 votes

3 answers

2k views

Is there a $(6,9,3)_2$ code?

combinatorics coding-theory

asked Feb 26, 2013 at 6:37

10 votes

3 answers

315 views

Measure of how much information is lost in an implication

logic soft-question information-theory philosophy kolmogorov-complexity

asked Apr 15, 2013 at 5:56

7 votes

1 answer

157 views

Generating function for $r^\binom{n}{2}$

combinatorics generating-functions integer-partitions infinite-product theta-functions

asked Mar 17, 2013 at 2:53

7 votes

2 answers

3k views

Curry-Howard correspondence

logic type-theory

asked Jul 4, 2012 at 6:11

7 votes

1 answer

1k views

Inner product for vector space over arbitrary field

linear-algebra

asked Oct 19, 2012 at 1:15

6 votes

4 answers

6k views

Group theory proof of Euler's theorem ($a^{\phi(m)} \equiv 1\mbox{ }(\mbox{mod }m)$ if $\gcd(a,m)=1$)

number-theory group-theory

asked Mar 19, 2012 at 7:30

5 votes

1 answer

156 views

Convergence of a sequence of partial binomial sums

real-analysis discrete-mathematics binomial-coefficients

asked Feb 12, 2012 at 21:25

5 votes

2 answers

1k views

Algorithm to multiply nimbers

algorithms finite-fields computational-complexity combinatorial-game-theory

asked Aug 26, 2014 at 1:40

4 votes

2 answers

385 views

Standard definition of group isomorphism

group-theory definition

asked Mar 11, 2013 at 6:54

4 votes

4 answers

427 views

Name that theorem: $G/\ker(\phi) \cong \bar{G}$ for epimorphism $\phi : G \to \bar{G}$

abstract-algebra group-theory terminology

asked Mar 14, 2013 at 3:49

3 votes

4 answers

1k views

Showing $(NM)/M \cong N/(N\cap M)$ for $N,M \triangleleft G$

group-theory

asked Apr 7, 2013 at 9:31

3 votes

1 answer

155 views

Notation: graphs representing relations between fields

finite-fields

asked Apr 6, 2012 at 3:17

2 votes

3 answers

125 views

Showing $a\perp b$ and $n\ne 0$ implies $a+bk\perp n$ for some $k$

elementary-number-theory

asked Mar 2, 2012 at 10:18

2 votes

1 answer

41 views

Finding $w_1,w_2,b$ such that $w_2 \sigma(w_1 x + b) \approx x$

calculus taylor-expansion approximation linear-approximation

asked Dec 21, 2015 at 6:33

1 vote

1 answer

430 views

'Union' of maps

functions notation definition

asked Mar 25, 2014 at 0:24

1 vote

1 answer

466 views

What's this graph? (8 vertices, 16 edges)

graph-theory

asked Sep 16, 2013 at 8:45

0 votes

1 answer

94 views

Notation for permutation corresponding to the action of a group element

group-theory notation terminology group-actions

asked Jan 16, 2014 at 4:56

0 votes

1 answer

68 views

Leaving out the indeterminate in an integral

calculus notation

asked Nov 27, 2012 at 6:42

0 votes

2 answers

422 views

Surjection from real numbers to complex numbers

elementary-set-theory

asked Dec 2, 2012 at 7:16

0 votes

1 answer

162 views

Tuple(?) with square brackets

notation coding-theory

asked Oct 20, 2012 at 1:58

0 votes

1 answer

189 views

Conditional entropy of repetition code over BSC

solution-verification information-theory

asked Sep 26, 2014 at 9:41

Stack Exchange Network

current community

your communities

more stack exchange communities

24 Questions

Has error correction been "solved"?

Kernel of composition of linear transformations

What does $\binom{-n}{k}$ mean?

Is there a $(6,9,3)_2$ code?

Measure of how much information is lost in an implication

Generating function for $r^\binom{n}{2}$

Curry-Howard correspondence

Inner product for vector space over arbitrary field

Group theory proof of Euler's theorem ($a^{\phi(m)} \equiv 1\mbox{ }(\mbox{mod }m)$ if $\gcd(a,m)=1$)

Convergence of a sequence of partial binomial sums

Algorithm to multiply nimbers

Standard definition of group isomorphism

Name that theorem: $G/\ker(\phi) \cong \bar{G}$ for epimorphism $\phi : G \to \bar{G}$

Showing $(NM)/M \cong N/(N\cap M)$ for $N,M \triangleleft G$

Notation: graphs representing relations between fields

Showing $a\perp b$ and $n\ne 0$ implies $a+bk\perp n$ for some $k$

Finding $w_1,w_2,b$ such that $w_2 \sigma(w_1 x + b) \approx x$

'Union' of maps

What's this graph? (8 vertices, 16 edges)

Notation for permutation corresponding to the action of a group element

Leaving out the indeterminate in an integral

Surjection from real numbers to complex numbers

Tuple(?) with square brackets

Conditional entropy of repetition code over BSC