Since CTP, “The F# library is split into two components. FSharp.Core.dll: Contains the core F# libraries, which will be stabilized and versioned infrequently. FSharp.PowerPack.dll: Contains additional useful F# libraries and tools which will version more frequently, and allow continued innovation on top of the core F# language and libraries. The fslex and fsyacc tools are part of the F# PowerPack.” (quoted from CTP release notes)

To use the PowerPack, you need to reference “Fsharp.Powerpack.dll” (in F# interactive, type #r “Fsharp.Powerpack.dll”).

• Linq: quotation compilation and evaluation via LINQ expression trees is part of the Powerpack, as well as query evaluation via LINQ expression Trees.