In an article I tried to understand (the german understanding) of:
(...) we’re outside the part of C where the standard Dirichlet series actually converges. But lo’ we can ask what’s the Ramanujan summation (...)
Here the interjection lo' got my interest. I found, for instance lo and behold in leo.org and thus I think I understand the meaning here, too.
But is there some root of that interjection (semantic, etymological,...)? I mean, the author has added an apostrophe so something should be behind it; Leo.org does not help here.