Object and Diagramm

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This is the German speaking branch of the forum. You might better post in the English branch.

By the way. I don't think someone will know what you actually intend. You should try to choose the subject more "speaking" and to be more precise about your question.

A square is defined by x=y. Thus what is what you really want to do?

Beside this I support both points of @Lupp 's answer.