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Mar
22
awarded  Yearling
Mar
13
comment When, how & who first gave this calculation of $\pi$
Euler, I suppose.
Mar
13
revised Series solution to first order differential equation
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Mar
13
answered Series solution to first order differential equation
Jan
21
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Dec
3
comment Definite integral reciprocal of polynomial plus trig function
$x^{1/4}$ is definitively not a polynomial... And, however, the integrand seems not to be elementary integrable. Neverthless, the definite integral exists (because the integrand is everywhere continuous in $[0,\pi/2]$), it is a positive real number (for the integrand is positive in $[0,\pi/2]$) and it approximately equals $1$. ;-)
Dec
3
revised Useful mathematical fora
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Oct
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Aug
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Apr
9
answered A basic question on bound of a function
Apr
9
comment A basic question on bound of a function
Oh, now I see...
Apr
9
comment A basic question on bound of a function
What about $a=0$? ;-)
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5
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22
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Sep
22
answered $\sum_{j=3n}^{2n}a_{j}=\sum_{j=2n}^{3n}a_{j}$: true or false?
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