elementary number theory : Math Help

Proving $N_2$ is not normal subgroup of $H_2$ if $\phi$ is not surjective

group-theory proof-writing
Updated April 18, 2019 18:20 PM

Directed set and partially/totally ordered sets.

elementary-set-theory order-theory well-orders
Updated April 18, 2019 18:20 PM

Class group of contains an element of order greater than $n$

algebraic-number-theory ideal-class-group
Updated April 18, 2019 18:20 PM

Cardinality of uncomputable functions

set-theory computability
Updated April 18, 2019 18:20 PM

Types of relations , besides equivalence relation and ordering relation?

elementary-set-theory
Updated April 18, 2019 18:20 PM

Sheaf of Closed Subset

algebraic-geometry sheaf-theory affine-geometry affine-varieties
Updated April 18, 2019 18:20 PM

A question regarding the Galois extension of the cyclotomic polynomial $\Phi_{15}$

abstract-algebra proof-writing field-theory galois-theory galois-extensions
Updated April 18, 2019 18:20 PM

Localisation of Category

category-theory
Updated April 18, 2019 18:20 PM

Models that realize all types

logic first-order-logic model-theory
Updated April 18, 2019 16:20 PM

Counterexample: linearly ordered sets for which there exists more than one isomorphism

proof-verification elementary-set-theory examples-counterexamples order-theory
Updated April 18, 2019 16:20 PM

Uncorrelatedness for random elements of finitely generated groups?

probability group-theory probability-theory finitely-generated cayley-graphs
Updated April 18, 2019 16:20 PM

Question about conjugacy classes in groups

abstract-algebra group-theory
Updated April 18, 2019 16:20 PM

An order-6 configuration

combinatorics geometry algebraic-geometry graph-theory recreational-mathematics
Updated April 18, 2019 16:20 PM

How many triplets of consecutive primes $p$, $q$, $r$ are such that $p^2+q^2+r^2$ is also prime?

number-theory
Updated April 18, 2019 16:20 PM

Mixed strategy equilibrium for subgame

game-theory nash-equilibrium
Updated April 18, 2019 15:20 PM

Drawing without replacement: why the order of draw is irrelevant?

probability probability-theory
Updated April 18, 2019 15:20 PM

Purely technical question on the definition of a sheaf : by Yoneda + restriction or by an equalizer

algebraic-geometry category-theory sheaf-theory limits-colimits yoneda-lemma
Updated April 18, 2019 15:20 PM

The transformation group of all bijections has a subset V of all strictly increasing bijections, show its a subgroup.

group-theory
Updated April 18, 2019 15:20 PM

Questions on Dirichlet's approximation theorem

calculus number-theory elementary-number-theory
Updated April 18, 2019 15:20 PM

Bounding the number of certain (translation) subsets in $\mathbb N \times \mathbb N$ with respect to given subsets

abstract-algebra combinatorics number-theory semigroups monoid
Updated April 18, 2019 14:20 PM

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