Triangle Counting Task

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A Triangle Counting Task is a ML Counting Task for triangles in a graph.



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  • http://mathworld.wolfram.com/TriangleCounting.html
    • QUOTE: Given rods of length 1, 2, ..., n, how many distinct triangles T(n) can be made? Lengths for which [math]\displaystyle{ l_i\gt =l_j+l_k \ (1) }[/math] obviously do not give triangles, but all other combinations of three rods do. The answer is : [math]\displaystyle{ T(n) = \begin{cases} \frac{1}{24} n(n-2)(2n-5), & \mbox{for } n \mbox{ even} \\ \frac{1}{24} (n-1)(n-3)(2n-1) & \mbox{for } n \mbox{ odd}. \end{cases} (2) }[/math] The values for n=1, 2, ... are 0, 0, 0, 1, 3, 7, 13, 22, 34, 50, ... (OEIS A002623). Somewhat surprisingly, this sequence is also given by the generating function : [math]\displaystyle{ f(x)=\frac{(x^4)}{(1-x)^3(1-x^2)} =x^4+3x^5+7x^6+13x^7+.... }[/math]

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