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The paper recalls and point to the origin of the transformation laws of thecomponents of classical and quantum fields. They are considered from the"standard" and fibre bundle point of view. The results are applied to thederivation of the Heisenberg relations in quite general setting, in particular,in the fibre bundle approach. All conclusions are illustrated in a case oftransformations induced by the Poincar\'e group.

Transformation laws of the components of classical and quantum fields and Heisenberg relations