meta user
network profile
| bio | website | twitter.com/#!/ziyuang |
|---|---|---|
| location | ||
| age | ||
| visits | member for | 2 years |
| seen | yesterday | |
| stats | profile views | 124 |
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Apr 14 |
revised |
Similarity between $I+N$ and $e^N$ when $N$ is nilpotent added 306 characters in body |
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Apr 14 |
revised |
Similarity between $I+N$ and $e^N$ when $N$ is nilpotent added 271 characters in body |
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Apr 14 |
asked | Similarity between $I+N$ and $e^N$ when $N$ is nilpotent |
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Oct 18 |
accepted | How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? |
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Oct 18 |
comment |
How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? Thank you, @André Nicolas, it's a nice answer and reference. Is there literature on decomposing an integer into a perfect square and a prime multiple of another perfect square (Just as the second part of the question)? |
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Oct 17 |
revised |
How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? edited title |
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Oct 17 |
revised |
How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? edited title |
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Oct 17 |
comment |
How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? A non-pythagorean question is added. |
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Oct 17 |
revised |
How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? added 79 characters in body |
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Oct 17 |
revised |
How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? added 79 characters in body |
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Oct 17 |
comment |
How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? Ah, $(a^2-b^2)^2+(2ab)^2=(a^2+b^2)^2$. So I have to find all $(a,b)$'s such that $a^2+b^2=2m$. |
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Oct 17 |
comment |
Solution to a system of linear equations in GF(2) An insightful answer. It is brilliant to consider $A^2$. To solve the puzzle I have to handle all the cases so I give the "√" to @user1551, but this is impressive. |
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Oct 17 |
comment |
Solution to a system of linear equations in GF(2) Thank you, @user1551. Actually the question is from a variant of lights out puzzle, where the light pressed affects the whole row and column. |
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Oct 17 |
asked | How many $n$'s can make $4m^2-n^2$ a perfect square? And, triple of a perfect square? |
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Oct 17 |
accepted | Solution to a system of linear equations in GF(2) |
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Oct 7 |
comment |
Solution to a system of linear equations in GF(2) I can't see why the rows $1,n+1,\cdots,(m-1)n+1$ are identical. Take $A$ for an example: after manipulation, the 1st row is $(1,1,1,0,0,0)$ and the 4th row is $(1,0,0,1,1,1)$. Did I make some calculation mistakes? |
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Sep 25 |
revised |
Solution to a system of linear equations in GF(2) added 104 characters in body |
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Sep 25 |
revised |
Solution to a system of linear equations in GF(2) added 11 characters in body |
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Sep 25 |
revised |
Getting the inverse of a lower/upper triangular matrix added 4 characters in body |
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Sep 25 |
accepted | How to calculate dual frames under constraints? |
