[#mp_units-quantity_character]
= xref:mp_units.adoc[mp_units]::quantity_character
:relfileprefix: ../
:mrdocs:

Quantity character

== Synopsis

Declared in `<mp‐units/framework/representation_concepts.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
enum class quantity_character : int8_t;
----

== Members

[cols=1]
|===
| Name
| `real_scalar` 
| `complex_scalar` 
| `vector` 
| `tensor` 
|===

== Description

Scalars, vectors and tensors are mathematical objects that can be used to denote certain physical quantities and their values. They are as such independent of the particular choice of a coordinate system, whereas each scalar component of a vector or a tensor and each component vector and component tensor depend on that choice.

A scalar is a physical quantity that has magnitude but no direction. It might be a real or complex number which affects which operations are allowed on a quantity.

Vectors are physical quantities that possess both magnitude and direction and whose operations obey the axioms of a vector space.

Tensors can be used to describe more general physical quantities. For example, the Cauchy stress tensor possess magnitude, direction, and orientation qualities.


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