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Maybe because your xmin is bigger than your xmax?

Or because you use a symbolic function?

Try the following:

f = lambda x, y: abs(x*y)
X = plot3d(f, (72, 105), (0.8293, 55.8271)
X

or maybe one of the following:

show(X)
show(X, viewer='threejs')
view(X)
view(X, viewer='threejs')

Maybe because your xmin is bigger than your xmax?

Or because you use a symbolic function?

Try the following:

f = lambda x, y: abs(x*y)
X = plot3d(f, (72, 105), (0.8293, 55.8271)
55.8271))
X

or maybe one of the following:

show(X)
show(X, viewer='threejs')
view(X)
view(X, viewer='threejs')