On the converse of Lagrange's theorem
14611
$A_4$ has no subgroup of order $6$?
42384
Сanonical form of a quadratic form by Lagrange's method
18181
Complete classification of the groups for which converse of Lagrange's Theorem holds
117990
Derivation of the method of Lagrange multipliers?
65700
Deriving Birkhoff's Theorem
126390
Covariance of Euler-Lagrange equations under change of generalized coordinates
54957
The necessary and sufficient condition for a unit element in Euclidean Domain
146540
Lagrange Multipler KKT condition
98358
A variational problem with a lagrangian , what is the lagrangian?
56266
Potential energy and the work energy theorem
717
Proof of Frullani's theorem
152274
An exercise from Conway's Complex Analysis on an application of Schwarz's Lemma
111233
Analytic function and the Lagrange interpolating polynomial
117595
Minimum Modulus Principle for a constant fuction in a simple closed curve
15851
the converse of Schur lemma
18054
Is there a proof from the first principle that the Lagrangian L = T - V?
51546
Geometrical Interpertation of Cauchy's Mean Value Theorem