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Michał Masny
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347
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How did “normal” come to mean “perpendicular”?
12
Automorphisms of $P(\Bbb N)$
7
Is the class of inverse semigroups globally determined?
7
Is the class of additive groups of rings axiomatizable?
6
For a monoid with zero $M$, how many additive operations on $M$ can there be making $M$ a ring?
347
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How did “normal” come to mean “perpendicular”?
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Cancellable elements of a power semigroup
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Is the class of inverse semigroups globally determined?
+5
Automorphisms of $P(\Bbb N)$
2
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Counterexamples in Algebra?
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