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Mathlib.Lean.Expr.Rat

Additional operations on Expr and rational numbers #

This file defines some operations involving Expr and rational numbers.

Main definitions #

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def Lean.Expr.rat? (e : Lean.Expr) :
Option Rat

Check if an expression is a "rational in normal form", i.e. either an integer number in normal form, or n / d where n is an integer in normal form, d is a natural number in normal form, d ≠ 1, and n and d are coprime (in particular, we check that (mkRat n d).den = d). If so returns the rational number.

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    def Lean.Expr.isExplicitNumber :
    Lean.Expr → Bool

    Test if an expression represents an explicit number written in normal form:

    • A "natural number in normal form" is an expression OfNat.ofNat n, even if it is not of type ℕ, as long as n is a literal.
    • An "integer in normal form" is an expression which is either a natural number in number form, or -n, where n is a natural number in normal form.
    • A "rational in normal form" is an expressions which is either an integer in normal form, or n / d where n is an integer in normal form, d is a natural number in normal form, d ≠ 1, and n and d are coprime (in particular, we check that (mkRat n d).den = d).
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