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If I try to calculate 0.0001 ^ 0.0001 using the y^x function I get 0.9990.. as answer.
Using 0.0001 x 0.0001 gives the correct answer 0.0000001.
Resetting the calculator gave the the same result.
Anyone having the same problem ?

There is no issue with WP31S.
The result is correct (at least for the real root).

If you have no other calc available, you may check it There.

0.0001 ^ 0.0001 returns the 1000th root of 0.0001
0.0001 * 0.0001 is equivalent to 0.0001 ^ 2

Thanks jch.
Back on track again.