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A quantity is a value followed by a units.

A value is always a real (=non-complex) numeric value in TABULA. However a variety of value sets are possible, e.g. integer, floating-point, Boolean.

There is no unique way of writing down a given quantity. Not even in SI-units.

Examples of different ways of writing down the same quantity: ten "domestic units" of electricity in SI-units:

   10 kWh
   10 kW h
   10000 W h
   3.6E7 kg·m²·s⁻²