# Talk:Lindenbaum method

"By $\overline{\overline{Vr_\mathcal{V}}}$ we denote the cardinality of $Vr_\mathcal{V}$" --- I am puzzled: what is $Vr_\mathcal{V}$? --Boris Tsirelson (talk) 16:37, 15 April 2013 (CEST)