  We provide a constructive treatment of basic results in the theory of central
simple algebras. One main issue is the fact that one starting result,
Wedderburn's Theorem stating that a simple algebra is a matrix algebra over a
skew field, is not constructively valid. We solve this problem by proving
instead a dynamical version of this theorem. One can use this to give
constructive proofs of basic results of the theory of central simple algebras,
such as Skolem-Noether Theorem. We illustrate this development by giving an
elementary constructive proof of a theorem of Becher (which is itself a
consequence of a celebrated theorem of Merkurjev).
