  A conjecture of Talagrand (2010) states that the so-called expectation and
fractional expectation thresholds are always within at most some constant
factor from each other. Expectation (resp. fractional expectation) threshold
$q$ (resp. $q_f$) for an increasing nontrivial class $\mathcal{F}\subseteq 2^X$
allows to locate the threshold for $\mathcal{F}$ within a logarithmic factor
(these are important breakthrough results of Park and Pham (2022), resp.
Frankston, Kahn, Narayanan and Park (2019)). We will survey what is known about
the relation between $q$ and $q_f$ and prove some further special cases of
Talagrand's conjecture.
