“How can you have a set that’s equal and not equivalent? You can’t.”
It’s wonderful to hear a student who isn’t locked into “What’s the formula to get the answer?” and automatically includes “no, that just won’t work,” without stress…
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Resource Room Dot Net Blog 
howardat58
September 22, 2015
I didn’t know that the word “equivalent” had anything to do with “sets”. Help !
xiousgeonz
September 22, 2015
According to the esteemed text, an equivalent set will have the same elements, but not necessarily the same number of them. (I’m not going to attempt to replicate set notation here…)