How could we solve the minimal path search problem if we had an Oracle function h(v r) that gave the precise cost of going from v to r? Why is it so difficult to create such a function?

Operations Research : Applications and Algorithms
4th Edition
ISBN:9780534380588
Author:Wayne L. Winston
Publisher:Wayne L. Winston
Chapter2: Basic Linear Algebra
Section: Chapter Questions
Problem 15RP
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How could we solve the minimal path search problem if we had an Oracle function h(v r) that gave the precise cost of going from v to r? Why is it so difficult to create such a function?

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