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Thank you, Gianluca and Sean, for explaining this surprising result. I understand what happened, and why, but I don't fully grasp the underlying point about symbolic numbers. I spent quite a lot of time trying to figure out what was going wrong,...

I am running a program which generates a sequence of outputs using Graphics. I would like these to display in a separate window. Each successive output should replace the previous one. That is, the outputs are like the frames in a movie. I would...