等概率圆

equal probability probability of reliability probability principle of equal effects principle of equal advantage interference of equal inclination catenary of equal resistance contour of equal loudness curve of equal bearing series of equal interval principle of equal opportunities additivity of probability probability of delay circle of equal probability events of equal probability circle of equal altitude circle of equal altitudes equal probability cep equal altitude circle Mohr's circle (circle of stress) surface of equal potentials principle of equal effects principle of equal advantage