Geodesic
On the rank of coefficientless equations in four unknowns in a~free semigroup
Sbornik. Mathematics, Tome 29 (1976) no. 2, pp. 257-280

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A survey of definitions of the rank of a coefficientless equation in a free semigroup is given. An algorithm is constructed which for every equation in four unknowns in a free semigroup discerns whether the rank of the equation is three or less than three. Bibliography: 5 titles. 
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     author = {G. S. Makanin},
     title = {On the rank of coefficientless equations in four unknowns in a~free semigroup},
     journal = {Sbornik. Mathematics},
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     volume = {29},
     number = {2},
     year = {1976},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1976_29_2_a9/}
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G. S. Makanin. On the rank of coefficientless equations in four unknowns in a~free semigroup. Sbornik. Mathematics, Tome 29 (1976) no. 2, pp. 257-280. http://geodesic.mathdoc.fr/item/SM_1976_29_2_a9/