Solution

1962 Canadian mathematical bulletin  
i) f(x) is a polynomial of degree (m-l)(n-l) whose non-zero coefficients are alternately -fi and -1, (ii) the number of non-zero coefficients is Mm + Nn-2MN where M, N are integers defined by Mm -Nn = 1, 0 < M < n , J. D. Dixon California Institute of Technology P 58. (Conjecture) A graph of ( ) + t edges with k t 0 < t < k has at most ( ) + { ) triangles.
doi:10.1017/s0008439500026138 fatcat:qso2vo3l3ba2nd4clb3w2ghvlm