Add image and pre-image #12
Description
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Proposal. Add:
A * set: The image of all points of the set by A.A' \ setorset / A: The pre-image of all the points by A.
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See again this comment.
Proposal. Add:
A * set : The image of all points of the set by A.A' \ set or set / A : The pre-image of all the points by A.