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What does invariant mean in mathematics?

What does invariant mean in mathematics? quantity which remains unchanged A quantity which remains unchanged under certain classes of transformations. Invariants are extremely useful for classifying mathematical objects because they usually reflect intrinsic properties of the object of study. What Read more…

Is MDD 93 42 EEC still valid?

Is MDD 93 42 EEC still valid? According to article 120(2) of Regulation (EU) 2017/475 on Medical Devices (the MDR), certificates issued in accordance with Directive 93/42/EEC will remain valid until 27 May 2024 at the latest. What is the Read more…