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Jul 27, 2011 at 6:18 comment added Kelly Davis Wow, welcome to MO, and thanks for the answer. I wasn't aware that there was still no progress on the Kirby diagram of universal $\mathbb{R}^4$.
Jul 26, 2011 at 21:07 comment added Zarathustra Welcome to MO!!
Jul 26, 2011 at 20:31 history answered Bob Gompf CC BY-SA 3.0