Sometimes I’m scared that, at some point in my past, I opened a pair of parentheses without closing them. Even worse, I’m sure I’ve feared this very thing in the past. Then again, maybe this is the common fear of all schemers: that our whole lives might now be a parenthetical comment.

I gave a couple of seminar talks on Lück, W. Approximating -invariants by their finite-dimensional analogues. Geom. Funct. Anal. 4 (1994), no. 4, 455—481. Here’s the main result in the paper. Let be a CW-complex, and filter as with so that . Let be […]