Proof that every positive integer is a sum of four integral squares
Carmichael, R. D.
Duke Math. J., Tome 2 (1936) no. 1, p. 243-245 / Harvested from Project Euclid
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Publié le : 1936-06-14
Classification:  
@article{1077489482,
     author = {Carmichael, R. D.},
     title = {Proof that every positive integer is a sum of four integral squares},
     journal = {Duke Math. J.},
     volume = {2},
     number = {1},
     year = {1936},
     pages = { 243-245},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1077489482}
}

Carmichael, R. D. Proof that every positive integer is a sum of four integral squares. Duke Math. J., Tome 2 (1936) no. 1, pp.  243-245. http://gdmltest.u-ga.fr/item/1077489482/