| Lag<TSource, TResult>(IEnumerable<TSource>, Int32, Func<TSource, TSource, TResult>) | Produces a projection of a sequence by evaluating pairs of elements separated by a negative offset. |
| Lag<TSource, TResult>(IEnumerable<TSource>, Int32, TSource, Func<TSource, TSource, TResult>) | Produces a projection of a sequence by evaluating pairs of elements separated by a negative offset. |