Purpose

• Aggregation : AG
• Conversion : Conv.
• Concatenation: Concat.
• Element:
• Equality
• Generation
• Grouping
• Join
• Ordering
• Partitioning
• Projection :
• Quantity Measures
• Set
• Restriction

• Aggregate Method
: Aggregations
• All(TSource) Method : Quantity Measures
• Any Method : Quantity Measures
• AsEnumerable(TSource) Method : Conversion (Deferred)
• Average Method
• Cast(TResult) Method Conversion  (Deferred)
• Concat(TSource) Method (Deferred)
• Contains Method Quantity Measures
• Count Method Aggregations
• DefaultIfEmpty Method : Element (Deferred)
• Distinct Method Set (Deferred)
• ElementAt(TSource) Method : Element
• ElementAtOrDefault(TSource) Method :Element:
• Empty(TResult) Method Generation (Deferred)
• Except Method Set (Deferred)
  • Except(TSource) Method (IEnumerable(TSource), IEnumerable(TSource))
  • Except(TSource) Method (IEnumerable(TSource), IEnumerable(TSource), IEqualityComparer(TSource))
• First Method Element
• FirstOrDefault Method Element
• GroupBy Method Grouping (Deferred)
• GroupJoin Method Grouping, Join (Deferred)
• Intersect Method Set (Deferred)
• Join Method Join (Deferred)
• Last Method : Element
• LastOrDefault Method : Element
• LongCount Method : Aggregate
• Max Method :Aggregate
• Min Method :Aggregate
• OfType(TResult) Method Conversion (Deferred)
• OrderBy Method : Ordering (Deferred)
• OrderByDescending Method Ordering (Deferred)
• Range Method : Generation  (Deferred)
• Repeat(TResult) Method : Generation (Deferred)
• Reverse(TSource) Method : Ordering   (Deferred)
• Select Method : Projection (Deferred)
• SelectMany Method : Projection (Deferred)
• SequenceEqual Method : Equality
• Single Method : Element
• SingleOrDefault Method : Element
• Skip(TSource) Method Partitioning (Deferred)
• SkipWhile Method Partitioning  (Deferred)
• Sum Method :Aggregate
• Take(TSource) Method : Partitioning (Deferred)
• TakeWhile Method : Partitioning  (Deferred)
• ThenBy Method : Ordering (Deferred)
• ThenByDescending Method : Ordering (Deferred)
• ToArray(TSource) Method : Conversion
• ToDictionary Method : conversion
• ToList(TSource) Method Conversion
• ToLookup Method : Conversion
• Union Method:  Set (Deferred)
• Where Method : Restriction 
(Deferred)