posted by Ros .
What would a counter-example be in math?
a.an example that proves the conjecture wrong
b.an example to show the formula is wrong
c.a very nice granite kitchen-top surface
d.an example to show the conjecture is true
Since this is not my area of expertise, I searched Google under the key words "math counterexample" to get this:
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.