Scalars

algebraic operation that takes two equal-length sequences of numbers

single field element, e.g. real number, in the context of linear algebra

instantaneous rate of change of the function

In linear algebra, a pseudoscalar is a quantity that behaves like a scalar, except that it changes sign under a parity inversion while a true scalar does not.

quantity in the theory of relativity which is invariant under a Lorentz transformation

field theory of scalar fields