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Timeline for conditional equality symbol

Current License: CC BY-SA 2.5

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Mar 22, 2012 at 8:12 vote accept James Propp
Apr 7, 2011 at 19:41 comment added Michael Lugo It might be useful. But if you're talking about teaching calculus, I'm afraid that a lot of students would just write down "=" for such a symbol and it wouldn't be worth the trouble.
Apr 7, 2011 at 16:36 answer added Finn Lawler timeline score: 6
Apr 7, 2011 at 2:42 history asked James Propp CC BY-SA 2.5