The completion of the `t`-chart at a rational point `(t, x/t - α)` with `α` a unit is the child concrete surface with exponents `(a + b, 0)`, compatibly with the chart substitution.

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The completion of the `t`-chart at a rational point `(t, x/t - α)` with `α` a unit is the child concrete surface with exponents `(a + b, 0)`, compatibly with the chart substitution. · Prove2Me