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17h
comment Is it possible to solve sudoku without backtracking?
You may be interested in playing with this solver. It's worth noting that 1) it has an extensive list of deductions it can use, including some that are too non-local to fit in the paradigm of "Eliminate the digits which are not suitable for that cell by looking in the row, column and the smaller square to which the cell belongs", and 2) there are still some grids it can't solve (including the last few in the example popup).
23h
reviewed Looks OK In statistics using a regression analysis in SPSS - - variables are hunger and amount of dancing
1d
reviewed Leave Open About the integral $\int_{-1}^1 \frac{1}{\pi^2+(2 \operatorname{arctanh}(x))^2} \, dx=\frac{1}{6} $
1d
reviewed Leave Open Line Integral: $\int_C{x^2}\:dy$
2d
revised Show that if $T_1$, $T_2$ are normal operators that commute then $T_1+T_2$ and $T_1T_2$ are normal.
deleted 1 character in body; edited title
2d
reviewed Looks OK How to solve a bi-quadratic equation with symbolic coefficients?
2d
reviewed Leave Closed Fruitful advice to get back to study Mathematics again?
Jul
28
comment $f(x)$ is a periodic function. What is its period?
@whacka: You could also ask "what are all the possible fundamental periods?" — which, at least if $f$ is to be real-valued, is not an equivalent question, as $\frac{1+x}{1-x}$ has no real fixed points.
Jul
28
revised $f(x)$ is a periodic function. What is its period?
cleanup
Jul
28
revised $f(x) =ax^6 +bx^5+cx^4+dx^3+ex^2+gx+h $ find f(7)
added 5 characters in body
Jul
28
revised $f(x) =ax^6 +bx^5+cx^4+dx^3+ex^2+gx+h $ find f(7)
given comments under the answers, this is the intended version of the question
Jul
28
reviewed Leave Open Infrequent fail of the popular parameter estimators, having several beta-distributed random variables to be estimated
Jul
28
reviewed Leave Open prove that for any 2n≥2 and any \a ​1 ​​ ,…,a ​n ​​ ∈N, we have the following:
Jul
28
reviewed Leave Open Cubic Depressed Form ! What can we deduce form it?
Jul
28
comment Is the inequality $| \sqrt[3]{x^2} - \sqrt[3]{y^2} | \le \sqrt[3]{|x -y|^2}$ true?
After over a hundred posts, you really should be learning to use MathJax...
Jul
28
reviewed Edit Is the inequality $| \sqrt[3]{x^2} - \sqrt[3]{y^2} | \le \sqrt[3]{|x -y|^2}$ true?
Jul
28
revised Is the inequality $| \sqrt[3]{x^2} - \sqrt[3]{y^2} | \le \sqrt[3]{|x -y|^2}$ true?
added 26 characters in body
Jul
28
reviewed Looks OK How to integrate $\int_0^{\infty} \frac{e^{ax} - e^{bx}}{(1 + e^{ax})(1+ e^{bx})}dx$ where $a,b > 0$.
Jul
27
reviewed Leave Open Distribution of $\sin(X) *\cos(Y)$ where $X,Y$ are iid r.v., uniformly distributed on $[0, 2 \pi]$
Jul
27
reviewed Leave Open If $A$ is a maximal ideal, then $\mathbb{F}_p[x,y]/A$ is a finite field