The beginning of the sequence.

For instance, integers are generally thought of as centering around 0

iex> origin(9)
0

The predessor in the sequence.

For integers, this is the number below.

iex> pred(10)
9

iex> 42 |> origin |> pred |> pred
-2

The successor in sequence.

For integers, this is the number above.

iex> succ(1)
2

iex> 10 |> origin |> succ |> succ
2