The principle of non-discrimination in international, European and national constitutional sources.

In a hierarchical and multilevel system of the sources of law, the acquisition of rights and the existence of the correlated duties must be based on the recognition and the affirmation of fundamental principles within International Treaties and Constitutional Charters.

The principle of non-discrimination – which generally states the full and equal enjoyment of rights by prohibiting illegitimate factors of discrimination – finds a legal basis in constitutional sources of international, European and national level.

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