-### Critical Load
-
-Critical load (sometimes called critical rate) is the offered load which
-leads to average loss ratio to become exactly equal to the target loss
-ratio.
-
-In principle, there could be such loss ratio functions which allow more
-than one offered load to achieve target loss ratio. To avoid that,
-PLRsearch assumes only increasing loss ratio functions are possible.
-
-Similarly, some loss ratio functions may never return the target loss
-ratio. PLRsearch assumes loss ratio function is continuous, that the
-average loss ratio approaches zero as offered load approaches zero, and
-that the average loss ratio approaches one as offered load approaches
-infinity.
-
-Under these assumptions, each loss ratio function has unique critical
-load. PLRsearch attempts to locate the critical load.
-
-### Load Regions
-
-Critical region is the interval of offered load close to critical load,
-where single measurement is not likely to distinguish whether the
-critical load is higher or lower than the current offered load.
-
-In typical case of small target loss ratio, rates below critical region
-form "zero loss region", and rates above form "high loss region".
-
-### Finite Models
-
-Of course, finite amount of trial measurements, each of finite duration
-does not give enough information to pinpoint the critical load exactly.
-Therefore the output of PLRsearch is just an estimate with some
-precision.
-
-Aside of the usual substitution of infinitely precise real numbers by
-finitely precise floating point numbers, there are two other instances
-within PLRsearch where an objects of high information are replaced by
-objects of low information.
-
-One is the probability distribution of loss count, which is replaced by
-average loss ratio. The other is the loss ratio function, which is
-replaced by a few parameters, to be described later.
-