Zeno also showed an interest in many other schools of Greek thought, including the well- known teachings of Plato, and he studied under various other teachers such as Diodorus Cronus and Philo. This broad approach to study followed by Zeno is something which is strongly recommended for anyone embarking on the study of any new discipline; to gain a broad understanding of all the varying points of view prevalent in such new field of study.
What does the word "such" mean?
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com/definition/such See definition #3. of the kind specified
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... to gain a broad understanding of all the varying points of view prevalent in such new fields of study.
This is the "kind" sense of "such", i.e. "new fields of study of this kind".
It is interpreted anaphorically, the antecedent probably being "schools of Greek thought, including the well-known teachings of Plato".