According to Russell's well known "principle of acquaintance" in epistemology, in order to understand a proposition, one must be acquainted with the meaning of every simple symbol making it up (see, e.g., KAKD, 159).
At a small zoo at Camp Szuts, new arrivals must get acquainted with a few captured animals, including an ocelot, a tarantula, a red caiman, an anaconda and a jaguar named Fred.
Crucially, more by accident than by intention, he also found his way into Method acting lessons with two recently arrived émigrés from Stanislavsky's Moscow Art Theatre, Andrius Jilinsky and Vera Soloviova, who taught that "to create truth on the stage, you must be acquainted with your own truth".
Working with something that is unpleasant can finally teach more because one must become acquainted with the unfamiliar.
So the scientist must become acquainted with many empirical facts so as to ensure that she is not ignorant of potentially falsifying data (IP §64).
Everyone must be acquainted with all lines of work, and then each person practices the one for which he shows the greatest aptitude.
Russell maintained that an agent must be acquainted with every constituent of a thought that she is in a position to entertain.
Molecular resistance, signaled by rising PSA levels despite castration, in the absence of clinical progression, is a much more common scenario that we must be acquainted with for patient education and proper design of clinical trials.
The second assumption might be difficult to satisfy, as it deals with the accuracy of the laboratory measurements under reservoir conditions The third assumption deals with the concept of the 3D technique; this means that the user must be acquainted with the basis and limitations of each method before using it.
On a correspondence conception of truth, one might add that to be fully justified in believing a proposition to be true one must be acquainted not only with the fact that makes the proposition true but the relation of correspondence that holds between the proposition and the fact.
