COMMENT ā VALID 00002 PAGES C REC PAGE DESCRIPTION C00001 00001 C00002 00002 Francez and Pnueli (1978) use time as a parameter and the C00003 ENDMK Cā; Francez and Pnueli (1978) use time as a parameter and the program counter as a distinguished variable in order to state and prove facts about programs that don't stop.