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5.3 Variable definitions

A variable definition binds one or more identifiers and specifies an initial value for each of them. The simplest kind of variable definition takes one of the following forms:

• (define ⟨variable⟩ ⟨expression⟩)
• (define (⟨variable⟩ ⟨formals⟩) ⟨body⟩)

  ⟨Formals⟩ are either a sequence of zero or more variables, or a sequence of one or more variables followed by a space-delimited period and another variable (as in a lambda expression). This form is equivalent to

  (define ⟨variable⟩
     (lambda (⟨formals⟩) ⟨body⟩)).
  

• (define (⟨variable⟩ . ⟨formal⟩) ⟨body⟩)

  ⟨Formal⟩ is a single variable. This form is equivalent to

  (define ⟨variable⟩
     (lambda ⟨formal⟩ ⟨body⟩)).
  

• Top level definitions
• Internal definitions
• Multiple-value definitions