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Weierstrass-Riemann function The everywhere continuous, but nowhere differentiable Weierstrass–Riemann functions  (red),  (green), and  (blue). Here  . Weyl sums Weyl sums of the form  for various  . Various parametrized surfaces Sphere parametrized through  . Torus parametrized through  . Klein bottle parametrized through  . Steiner's Roman surface parametrized through  . Cross cap parametrized through  . Fractional derivatives Real part (left graphic) and imaginary part (right graphic) of the fractional derivatives of  . Real part of the fractional derivatives of  over the  .
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