On the relation of congruence in finite geometries
PAUL KUSTAANHEIMO (1957)
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PAUL KUSTAANHEIMO (1957)
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Scott Ahlgren (2003)
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We present a countable infinite chain of conditions which are essentially weaker then congruence modularity (with exception of first two). For varieties of algebras, the third of these conditions, the so called 4-submodularity, is equivalent to congruence modularity. This is not true for single algebras in general. These conditions are characterized by Maltsev type conditions.
Magill, K.D.jun. (1984)
International Journal of Mathematics and Mathematical Sciences
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Ernst S. SELMER (1953)
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Eckford Cohen (1960)
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O. Kolberg (1962)
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