Annotating a scheme with invariants
{"Image DocumentName": "Annotating a scheme with invariants", "Image ImageDescription": "start. A. \uf06a\uf028A): x1>=0 /\\ x2>=0. \uf06a\uf028B): x1=y1 x2+y2 /\\ y2>=0. \uf06a\uf028C): x1=y1 x2+y2 /\\ y2>=0 /\\ y2>=x2. \uf06a\uf028D):x1=y1 x2+y2 /\\ y2>=0 /\\ y2<x2. \uf06a\uf028E):x1=z1 x2+z2 /\\ 0<=z2<x2. Notice: \uf06a(A) is the initial condition, \uf06a\uf028 E\uf029\uf020is the input-output condition. (y1,y2)=(0,x1) B. T. F. y2>=x2. C. D. (y1,y2)=(y1+1,y2-x2) (z1,z2)=(y1,y2) E. \uf06a\uf028A) Is the precondition of (y1,y2)=(0,x1) and \uf06a\uf028B) is its postcondition. halt.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}