This question concerns computing subtraction using a production system. Assume that WM initially contains information to deal with individual digits in the following form: (digitMinus top: n bot: m ans: k borrow: b), where n and m are any digits, and if n ≥ m, then k is n − m and b is 0, else k is 10 + n − m and b is 1. For example, (digitMinus top: 7 bot: 3 ans: 4 borrow: 0) would be in WM, as would (digitMinus top: 3 bot: 7 ans: 6 borrow: 1). The working memory also specifies the first and second arguments of a subtraction problem (the subtrahend and minuend): (topNum pos: i digit: d left: j) and (botNum pos: i digit: d left: j), where d is a digit, and i and j are indices indicating the current position of the digit and its neighbor to the left, respectively
Imagine yourself as US Army Officer in Afghanistan. You take fire from a village. You can risk the lives of the men and women under your command by telling them to enter the village and carefully separate the insurgents (if they’re there) from the civilians; or you can call in an airstrike
November 9, 2015
3:12 am
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