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Quadratic forms and orthogonal complement

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#linear-algebra #quadratic-forms
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I know 3 sides of a triangle and I'm trying to find the angles

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#trigonometry #quadratics #quadratic-forms
304
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Group structure on the Dirichlet binary composition of quadratic forms

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#number-theory #algebraic-number-theory #quadratic-forms #representations-by-quadratic-forms
166
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Why is $\max_{c^TBc=1}c^T a a^Tc =a^TB^{-1}a$?

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#linear-algebra #quadratic-forms #non-convex-optimization #qcqp
125
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How can I determine whether a quadratic form is "almost universal"?

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#elementary-number-theory #reference-request #representation-theory #quadratic-forms
1.6k
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Find the set of primes $p$ which $6$ is a quadratic residue $\mod p$

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#elementary-number-theory #quadratic-forms #quadratic-residues #quadratic-reciprocity
1.3k
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Convexity of the Root of a Sum of Quadratic Forms

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#convex-analysis #quadratic-forms
46
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Genus of $f(x,y,z) = x^2+y^2+7z^2$

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#number-theory #quadratic-forms
79
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How to convert from a quadratic form to canonical, when there's no squared unknown?

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#linear-algebra #quadratic-forms #quadrics
45
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Solution of a quadratic matrix equation

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#matrices #systems-of-equations #quadratic-forms
54
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if $x^T*A*x=0$ can it be proven that det(A)=0

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#matrices #determinant #matrix-equations #quadratic-forms
720
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The set of integers $n$ expressible as $n=x^2+xy+y^2$

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#number-theory #elementary-number-theory #algebraic-number-theory #quadratic-forms #eisenstein-integers
615
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How to convert the given data to a quadratic polynomial form?

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#polynomials #quadratic-forms #piecewise-continuity
481
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Primitive binary quadratic forms.

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#number-theory #algebraic-number-theory #quadratic-forms
76
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primitive binary quadratic forms and the number of automorphs.

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#number-theory #quadratic-forms

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