One one side, x and y enter a black box, and their result enters a black box with z.  This is shown to be equivalent to the other side, where x enters a black box with the result of y and z after being passed through yet another black box.

Image by Stephan Kulla via Wikimedia Commons

Which of the following properties does the image above represent?

Choose one answer

Type a concept, like “slope” or “photosynthesis”.

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