Merge pull request #82 from minux/fix-typo

doc/cuckoo.tex: fix typo in math

doc/cuckoo.tex

@@ -78,7 +78,7 @@ \section{Introduction}
 in what could well be the simplest possible asymetric proof-of-work,
 combining scalable memory usage with trivial verifiability.
 Unfortunately, as pointed out in \cite{equihash16}, the "golden collision" search technique of \cite{parallel99}
-allows for reducing memory consumption $q$-fold while increasing runtime only $\sqrt(q)$, effectively breaking the scheme.
+allows for reducing memory consumption $q$-fold while increasing runtime only $\sqrt{q}$, effectively breaking the scheme.
 Momentum is interesting though as both Cuckoo Cycle and Equihash generalize birthday collision in different ways.
 %In section~\ref{cycle_length_choice} we show that Momentum is in essence a special case of Cuckoo Cycle,
 %one that is particularly susceptible to time-memory trade-offs.