The Sverdlovsk Notebook () is a collection of unsolved problems in semigroup theory, first published in 1965 and updated every 2 to 4 years…
The Sverdlovsk Notebook () is a collection of unsolved problems in semigroup theory, first published in 1965 and updated every 2 to 4 years since.
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Source: List of unsolved problems in mathematics (CC BY-SA 4.0)