Torsion group (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Torsion group" in English language version.

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Ebbinghaus, H.-D.; Flum, J.; Thomas, W. (1994). Mathematical logic (2. ed., 4. pr. ed.). New York [u.a.]: Springer. pp. 50. ISBN 978-0-387-94258-2. Retrieved 18 July 2012. However, in first-order logic we may not form infinitely long disjunctions. Indeed, we shall later show that there is no set of first-order formulas whose models are precisely the periodic groups.