| MaxByTSource, TKey(IEnumerableTSource, FuncTSource, TKey) | Returns the maximal elements of the given sequence, based on the given projection. |
| MaxByTSource, TKey(IEnumerableTSource, FuncTSource, TKey, IComparerTKey) | Returns the maximal elements of the given sequence, based on the given projection and the specified comparer for projected values. |