Theorem (double inverse) :If x is an element of
{"Image DocumentName": "Theorem (double inverse) :If x is an element of", "Image ImageDescription": "the group then. Proof: Theorem (reversal rule) If x and y are elements of the group then. Proof ??", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}