WeierstrassRiemann 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 .
