Act03_Satisfaction_and_Pgms

# Act03_Satisfaction_and_Pgms - Illinois Institute of...

This preview shows pages 1–2. Sign up to view the full content.

CS 536 Activities for Lecture 3 Activity 1: Satisfaction and Validity A. Why? Our program speci ± cations are written using predicates, so it’s good to know what it means for a predicate to be true in a state or in all states. B. Outcomes At the end of this activity you should: Be able to check a predicate for satisfaction (in a state) or validity. C. Questions Let ! ! " x = 3 # y = 4 # b[0] = 7 # b[1] = 9 , let ! # = ! ! [ x ! 4 ], and let ! \$ = ! # [ z ! –5 ]. 1. Does ! ! ! x < y # b[x–2] < b[y–3] ? Does ! # ! x < y # b[x–2] < b[y–3] ? 2. Does ! \$ ! z > 0 \$ 2+2 = 5 ? Does ! \$ ! 2+2 = 5 \$ z > 0 ? 3. Does ! ! ! % k . b[k] < b[k+1] ? If so, what witness did you use? Are there other possible witnesses? 4. Does ! ! ! % z . b[z] < b[z+1] ? Does it matter that z is unde ± ned in ! ! ? 5. Does ! ! ! % x . b[x] < b[x+1] ? Does it matter that ! ! ( x ) is de ± ned? Does it matter what value ! ! ( x ) is? [Does it matter that x is de ± ned in ! ! ?] 6. What do we have to check to determine whether or not

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 2

Act03_Satisfaction_and_Pgms - Illinois Institute of...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online