I added it. I couldn't find documentation for what I should put as the language name in the mark-down, so I assumed "fsharp".

F# translation submitted, please review! :)

My pleasure. If I understand your request correctly, all I needed to do was Edit, switch to the "Test Cases" tab and click "Publish"? I have done this. If you needed something different, please let me know.

You're welcome! The other katas in this series will also be receiving translations as I get time :)

Thanks for the clarification. I missed that part of the problem description. Perhaps we should add that as a static test, not just a random one?

This solution actually has the wrong precedence for the unary - operator. I managed to get it through by running until that random test did not generate. I am about to submit a new solution that addresses this issue.

The random tests that are run on an attempt sometimes runs a test with the format "sqrt(-5&(1+1--1+-1))" with the expected result of "ERROR: Formula / Calculation code 4". Sometimes it caused my solution to fail because it calculated a result, 5 in this example, because -5 squared is 25, the square root of which is 5. I think this test's expectation is based on a negative square root, but when that exponent is even, the argument to square root is no longer negative. I was able to pass the tests by attempting until that case did not come up. Does the & supposed to have higher precedence than the unary - operator, or is this test flawed?

Surely this code has the gnarliest indentation I've ever seen. Seems to have a just a bit of code duplication...

This code almost broke my brain. It's so difficult to understand that I'm not sure whether this was intentionally obfuscated or...