Top network posts

• 13 Characteristic subgroups and automorphisms
• 13 Does there exist a pair of infinite fields, the additive group of one isomorphic to the multiplicative group of the other?
• 12 When do $P$ $\subseteq$ $N$ $\subseteq$ $M$ and $P \cong M$ imply $N \cong M$?
• 11 $f(x) $ be the minimal polynomial of $a$ (algebraic element) over $\mathbb Q$ , let $b=f'(a) \in \mathbb Q(a)$ , then is $\mathbb Q(a)=\mathbb Q(b)$?
• 8 What is the cardinality of the set of equivalence classes of countable order types under bi-embeddability?
• 7 If a ring R has one sided divisor of zero then show that the R has a both sided divisor of zero.
• 7 A topology on algebras that coincides with a certain idea of density
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