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Like most modern languages, F# comes with its own standard library. The F# library, however, comes in two parts:
FSharp.Core.dll
FSharp.Core.dll is implicitly referenced by every single F# application and is the F# library. It contains the definitions for common types such as list, Async, option, and so on.
The F# PowerPack
The F# PowerPack is a set of experimental extensions and additional functionality meant to augment the F# library: for example, modules enabling F# applications to be source-level-compatible with the OCaml programming language.