The completion of the `t`-chart at its origin `(t, x/t)` is the concrete surface with unit `substUnit O 0 u` and exponents `(a + b, b)`, compatibly with the chart substitution.

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The completion of the `t`-chart at its origin `(t, x/t)` is the concrete surface with unit `substUnit O 0 u` and exponents `(a + b, b)`, compatibly with the chart substitution. · Prove2Me