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Typical Constant Names

• Choose a constant name that reflects the name of the variable.

  "We prove (forall x: G). We take an arbitrary constant x₀ and show G[x <- x₀]."

• Choose the variable name itself as the constant name.

  "We prove (forall x: G). We take an arbitrary constant x and show G."

  "We prove (forall x: G). Take arbitrary x. Then ...(proof of G).

Constant name must not yet appear in knowledge or goal!