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| bio | website | |
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| location | ||
| age | ||
| visits | member for | 1 year, 2 months |
| seen | Apr 30 at 20:55 | |
| stats | profile views | 1,158 |
"You have enemies? Good. That means you've stood up for something, sometime in your life" - Winston Churchill
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Apr 28 |
answered | Approximating log of factorial |
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Apr 27 |
answered | What is proxy graph? |
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Apr 26 |
comment |
How do you find all $n$ such that $\phi(n)|n$ @LHS That is correct, I just wanted to see if you could think further. |
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Apr 26 |
comment |
A book for self-study of matrix decompositions Yes that is correct. Also if you want to try out some software packages, NIST's JAMA (math.nist.gov/javanumerics/jama) is one option you might consider. |
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Apr 26 |
answered | A book for self-study of matrix decompositions |
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Apr 23 |
answered | $\int_0^{2\pi}\sin\frac{x}{2}\cos^2\frac{x}{2}\,dx$ |
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Apr 23 |
comment |
How do you find all $n$ such that $\phi(n)|n$ @LHS think about it. Can $n$ be prime? or Can $n$ be odd? |
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Apr 23 |
comment |
Find the sum of the roots of the equation? @vikiii the sum of the roots is the absolute value of the coefficient of $x^9$ which is the absolute value of $1+ {10 \choose 1} (-10) = 1 - 100 = -99$ and that absolute value is $99$. For instance what is the sum of the roots of $(x-2)^2+(x-4)^2=0$? which is $2x^2-12x+20=2(x^2-6x+10)=0$. The sum of the roots is the absolute value of the coefficient of $x$ and that is 6. |
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Apr 23 |
comment |
What is $\lim\limits_{k \to 0}{f(k) = 2 + k^{\frac{3}{2}}\cos {\frac{1}{k^2}}}$ @mathstudent Arturo is right (listen to the master). The limit of $cos\left(\frac{1}{k^2}\right)$ does not exist. snipurl.com/236mdru |
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Apr 23 |
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Evaluate $\int \cos(\cos x) dx$ @jasoncube You have to accept some of the answers of your questions . Otherwise fewer people will be interested in answering you. You acceptance rate is 0%. |
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Apr 22 |
comment |
How to show that $91$ is a pseudoprime to the base $3$? Oops! That was indeed a good catch (should have paid more attention) |
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Apr 22 |
awarded | Revival |
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Apr 21 |
answered | How to find bits you need to represent one variable? How many integers( 16 or 32 bits) you need when programming the problem? |
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Apr 21 |
answered | How to show that $91$ is a pseudoprime to the base $3$? |
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Apr 21 |
awarded | Necromancer |
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Apr 21 |
revised |
Puzzle - 123456789 = 100 with three operations? added 234 characters in body |
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Apr 20 |
awarded | Revival |
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Apr 20 |
answered | Puzzle - 123456789 = 100 with three operations? |
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Apr 20 |
comment |
Puzzle - 123456789 = 100 with three operations? I've got another $(1-2+3-4+5)\times6 -7+89$ |
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Apr 20 |
comment |
Puzzle - 123456789 = 100 with three operations? $(1 \times 23) - 4+5-6-7+89 = 100$ |
