Quantum Computing, Quantum Algorithms.
circles which are mirror images, but with the sign flipped. Zero to pi and zero to minus pi radians, 0 to 180 degrees and 0 to minus 180 degrees, and 0.0 to 0.5 and 0.0 to minus 0.5 as a decimal fraction. Infinite circles or waves (cycles), but periodic based on the size of one cycle. Four pi