I think it is anyway. We're doing calculus of several variables at the
minute, and our lecturer showed us a low-res wireframe hf of this
function to demonstrate stationary points (including saddles)

function{ cos(x)*cos(z)*exp(-sqrt(x*x+z*z)/2)-y }

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signature{
  "Grey Knight" contact{ email "gre### [at] yahoocom" }
  site_of_week{ url "http://digilander.iol.it/jrgpov" }
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