In article <3A96976D.C31B21D0@reading.ac.uk> , Michael Andrews 
<M.C### [at] readingacuk>  wrote:

> 1) this function is symetric about the diagonals so, for example, the
> points (2,3), (3,2), (-2,-3), (-3,-2) all give the same values. The axes
> give 0*I2 or I1*0 and so return the same value along their length.

l1*l2+l2


     Thorsten

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