F#

So anyway I have begun my foray into F#.  Because I plan to use .net in my next project I think it will be fun to learn F# in addition to C# and use both languges in the project.  To this end I just ordered Expert F#.  Knowing /prog/ is infinitely more expert then me: 

what does /prog/ think about .net?
what does /prog/ think about F# (ocaml)?
What type of tasks are better to be performed in F# vs C# (Math type tasks heavy)?

>>42

You should be aware that a given .Net assembly needs to be entireley in the same language. It won't create 1 assembly from multiple languages.

Don't confuse that with the fact that .Net doesn't care what language an assembly is written in.

Creating a class in F# and another class in C# and trying to put them in the same assembly (dll) won't work.

Creating a class in F#, compiling it to an assembly and then referencing and calling that class from a C# assembly will be 100% fine.

If you are creating a library of algorithms, it would be strange to have 2 assemblies for a common library. So the best approach would be to implement each unit of functionality in the same language, but your entire app can be written in many.