• ← $OutputForms

$PrintForms

$PrintForms

contains the list of basic print forms. It is updated automatically when new PrintForms are defined by setting format values.

• • $PrintForms

Suppose now that we want to add a new format MyForm. Initially, it does not belong to $PrintForms:

• • MemberQ[$PrintForms, MyForm]

Now, let's define a format rule:

• • Format[F[x_], MyForm] := "F<<" <> ToString[x] <> ">>"

Now, the new format belongs to the $PrintForms list

• • MemberQ[$PrintForms, MyForm]