News for hackers. Stuff that matters.
Re:Which countries are mentioned the most on Hacker News? by obelisk_ on Tuesday February 16, 2016 @05:28AM (#11108963)
Re:Which countries are mentioned the most on Hacker News? by odovdor on Tuesday February 16, 2016 @09:02AM (#11109811)
Your link points to some math review book by the same author.

I believe the author meant the drillbook such as https://issuu.com/normagee/docs/scanavi_sbornik_konkursnih_z....