• Bibliography
    • @Aktosun_2009
    • @Carinena2023
    • @KobayashiNomizu1996
    • @MR2001541
    • @Morando_mu_variational
    • @PaolaPfaffian
    • @Stephani
    • @arnold1992ordinary
    • @barcoThesis
    • @basarab
    • @berrone2003inverse
    • @blumanlibro
    • @bongaartsshort
    • @bryant2013exterior
    • @cap2009parabolic
    • @chicone2006ordinary
    • @conmorando
    • @feigin1975characteristic
    • @fels1999moving
    • @fels2007integrating
    • @gaetamorando
    • @govinder1995determination
    • @griffiths1974cartan
    • @hu2015inverse
    • @ivey2016cartan
    • @landsberg1997exterior
    • @lawvere2009conceptual
    • @lee2006riemannian
    • @lee2013smooth
    • @lychagin2007contact
    • @malament2012topics
    • @malham2016introduction
    • @muriel01ima1
    • @needham2021visual
    • @olver86
    • @pancinf-structures
    • @paola.frobenius
    • @saunders1989geometry
    • @sergyeyev2018new
    • @sharpe2000differential
    • @sherring1992geometric
    • @strocchi2008introduction
    • @warner
  • Home
  • ☕REFLECTIONS
    • 4-dimensional spaces
    • Bell's experiment
    • Dirac equation
    • Elliptic, hyperbolic and parabolic geometry
    • Euclidean plane
    • Feynman's path integral formulation
    • Generalization of the flatness of R3
    • Heisenberg approach to QM
    • Heisenberg vs Schrodinger picture
    • Hermitian form, inner product and symplectic form relationship
    • On Many Worlds, entanglement and hidden variables
    • On Physics from the beginning
    • Time zones example
    • Where is the geometry in a Klein geometry?
    • Why complex numbers in QM
    • Why did physics go quantum
    • about Lie algebras and involutive sets of vector fields
    • about solvable algebras and solvable structures
    • bra-ket notation
    • change of coordinates in quantum mechanics
    • complex eigenvalues
    • complexification of a vector space
    • connection form for LV in R3
    • connection form for LV in a surface
    • connections summary
    • covariance and contravariance in linear algebra
    • covariance and contravariance on manifolds
    • curvature like a driving force
    • double slit experiment
    • duality in exterior algebras
    • electromagnetic field
    • example left invariants vector fields and Maurer-Cartan form
    • formulation of QM
    • general covariance and contravariance
    • integration and derivation
    • intuition behind tensors
    • method of moving frames
    • outline of Galois theory
    • particle with position and spin
    • quantum approach to particle motion- an example
    • relation SO(3) and SU(2)
    • relation of Lie derivative, covariant derivative and torsion
    • relation symplectic form and Riemannian metric
    • relationship parallel transport, covariant derivatives and metrics
    • several coupled oscillators
    • states and observables
    • visualization of Lie groups
  • ♾️ CONCEPTS
    • ALGEBRA
      • Galois group
      • differential ideal
      • dual vector space
      • homogeneous space
      • inverse limit
      • local ring
      • localization of a module
      • localization of a ring
      • locally free module
      • normal subgroup
      • projective module
      • semidirect product
      • solvable Lie algebra
      • solvable group
      • splitting field
    • ALGEBRAIC GEOMETRY
      • locally free O-module
      • locally free sheaf
      • presheaf
      • sheaf
    • ANALYSIS
      • Padé aproximant
      • canonical immersion theorem
      • canonical submersion theorem
      • submersion
    • Banach algebra
    • Bessel functions
    • Boltzmann distribution
    • Boolean algebra
    • CATEGORY THEORY
      • adjoint functors
      • category of sets
      • category
      • coproduct in categories
      • functor
      • group as a category
      • groupoid
      • monoid
      • product in categories
    • Cauchy characteristic vector fields
    • Cauchy complete
    • Cauchy stress tensor
    • Cauchy's theorem
    • Christoffel symbols
    • Clifford algebra
    • DEs
      • Abel equation
      • Cauchy problem
      • Cinf_k symmetry
      • Lie point symmetry
      • Navier-Stokes equations
      • ODE
      • Riccati equation
      • Schrodinger equation (general family)
      • Vessiot distribution
      • characteristics of first-order partial differential equation
      • first integral
      • generalized Cinf-symmetry ODE
      • generalized symmetry of an ODE
      • generating function
      • integrating factor
      • lambda-symmetry
      • prolongation formula for vector fields
      • prolongation of a diffeomorphism
      • quadrature
      • strong symmetry
      • symmetry group of a DE system
      • system of DEs
      • system of ODEs
      • system of first order ODEs
      • system of first order linear ODEs- complex case
      • system of first order linear ODEs- real case
      • wave equation
    • DISCRETE DG
      • 2-complex
      • Discrete Differential Geometry
      • discrete differential
      • discrete inmersion
      • discrete k-form
    • Dirac delta
    • Euclidean geometry
    • Euclidean group
    • Euler characteristic
    • Euler operator
    • Euler-Lagrange
    • FUNCTIONAL ANALYSIS
      • Banach space
      • Hilbert space
      • inner product space
      • normed space
    • Finsler manifold
    • Fock space
    • Fourier transform
    • Frobenius integrable 1-form
    • G-structure
    • GEOMETRY
      • Cartan distribution
      • Cartan geometry
      • G-bundle
      • Gauss map
      • Gaussian curvature
      • Hodge star operator
      • Klein geometry
      • Levi-Civita connection
      • Lie algebra
      • Lie bracket
      • Lie derivative for tensors in general
      • Lie derivative of forms
      • Lie derivative of vector fields
      • Maurer-Cartan form
      • Moebius transformations
      • Pfaffian equation
      • Pfaffian system
      • Poincare half plane
      • Ricci curvature tensor
      • Riemannian metric
      • Riemannian volume form
      • Theorema Egregium
      • Weingarten map
      • adjoint representation
      • associated bundle
      • associated connection
      • bundle
      • coframe on a manifold
      • commutator subalgebra
      • completely integrable distribution
      • completely non-integrable
      • connection on a fiber bundle
      • cross section
      • curvature of a connection
      • curvature of a curve
      • curvature of a distribution
      • differential operator
      • distribution
      • embedded manifold
      • exponential map
      • extension and reduction of a principal bundle
      • first fundamental form
      • foliation
      • frame bundle
      • frame on a manifold
      • functional dependence
      • fundamental vector field
      • geodesic
      • group action
      • group representation
      • horizontal cotangent bundle
      • hyperbolic geometry
      • immersed manifold
      • integral submanifold
      • interior product
      • involutive distribution
      • isothermal coordinates
      • jet bundle
      • linear connection
      • moving frame
      • normal and geodesic curvature of a curve
      • normal curvature of an immersed surface
      • orbifold
      • principal bundle
      • principal connection on a principal bundle
      • principal curvatures
      • projectable vector field
      • prolongation of a section
      • pseudo-Riemannian manifold
      • pseudosphere
      • second fundamental form
      • shape operator
      • solder form
      • solvable structure
      • structure 1-form of a distribution
      • surface
      • symmetry of a distribution
      • torsion of a curve
      • transversal algebra of symmetries
      • transverse geometry
      • vector bundle connection
      • vector field
      • vertical bundle
    • Gaussian wave packet
    • Gelfand spectrum
    • Geometric Algebra
    • Grassmannian bundle
    • Grassmannian manifold
    • Hamiltonian equations
    • Hamiltonian group action
    • Hamiltonian symmetry
    • Hamiltonian vector field
    • Hermitian matrix
    • Hermitian operator
    • Hessian matrix
    • Inverse Scattering Method
    • Jacobi equation
    • Jacobi field
    • Jacobi last multiplier
    • Jordan canonical form of a matrix
    • Kaluza-Klein theory
    • Killing vector field
    • Laplace transform
    • Laplace's equation
    • Laplacian operator
    • Lax pair
    • Legendre transform
    • Lie algebra action
    • Lie group
    • Lie series
    • Lipschitz continuous function
    • Lorentz boost
    • Lorentz group
    • Lorentzian manifold
    • Mellin transform
    • Minkowski space
    • Noether symmetry
    • PDE
    • Pauli equation
    • Pauli matrices
    • Poincare disk
    • Poincare group
    • Poisson algebra
    • Poisson bracket
    • Poisson manifold
    • Poisson map
    • Poisson's equation
    • Polya vector field
    • Relativistic Field Theory
    • Riemann curvature tensor
    • Riemann normal coordinates
    • Riemann sphere
    • Riemann zeta function
    • Riemannian geometry
    • Riemannian manifold
    • SO(3)
    • SU(2)
    • Schrodinger equation
    • Stern-Gerlach experiment
    • Stokes' theorem
    • Viviani's theorem
    • Wronskian
    • absolute parallelism
    • affine group
    • angular momentum
    • anti-Hermitian operator
    • automorphism
    • basis and change of basis
    • c-star algebra
    • canonical commutation relations
    • center of a ring-group
    • central algebra
    • centralizer
    • classical Hamiltonian system
    • closed map
    • coherent sheaf
    • conformal map
    • conjugate transpose
    • conservation law
    • contact transformation
    • continuity equation
    • contorsion
    • contractible space
    • covariant derivative along a curve
    • covariant derivative operator
    • covering group
    • covering system
    • curl
    • curvature of a Cartan geometry
    • decomposable k-form
    • derivation in an algebra
    • determinant
    • differential function
    • distribution (functional analysis)
    • divergence
    • dynamical system
    • eigenvalues
    • eigenvector
    • emission spectrum
    • endomorphism
    • energy of a curve
    • energy-momentum tensor
    • entire function
    • equivalent Lagrangians
    • evolution equation
    • evolutionary vector field
    • exact sequence
    • excited state
    • exponential map for Riemannian manifolds
    • exterior algebra
    • exterior covariant derivative
    • exterior derivative
    • exterior differential system
    • extrema
    • extrinsic curvature
    • f-related vector fields
    • faithful action
    • flag of foliations
    • flag
    • flow of observables in CM
    • four-current
    • four-momentum
    • free action
    • gauge theory
    • general linear group
    • general relativity theory
    • generalized momentum
    • genus
    • geodesic flow
    • geodesic polar coordinates
    • geodesic vector field
    • geodesically complete manifold
    • global Gauss-Bonnet theorem
    • heat equation
    • holomorphic
    • holonomic constraint
    • holonomy
    • homogeneous ideal
    • homogeneous linear PDE
    • induced matrix norm
    • inhomogeneous linear PDE
    • inner automorphism
    • integrable systems
    • integral of motions
    • inverse Jacobi multiplier
    • isometry
    • lattice
    • left invariant vector field
    • left-invariant differential form
    • length of a curve
    • local chart connection
    • local group of transformations
    • locally compact
    • mZK equation
    • manifold
    • material derivative
    • matrix algebra
    • matrix exponential
    • mean square deviation
    • method of characteristics
    • metric space
    • module
    • n-volume in an m-dimensional vector space
    • nonholonomic constraint
    • nonlocal symmetry
    • normal topological space
    • one-parameter subgroup
    • operator on a normed space
    • orthogonal and special orthogonal groups
    • orthogonal matrix
    • orthonormal frame bundle
    • paracompact
    • parallel curves
    • parallel transport
    • parallel vector field
    • parallelizable manifold
    • particle detector
    • partition of unity
    • point transformation
    • positive functional
    • pregeodesic vector field
    • principal bundle morphism
    • principal direction
    • principle of least action
    • projection
    • projective linear group
    • projective representation
    • projective space
    • propagator
    • proper action
    • quadratic form
    • quantum field
    • quantum harmonic oscillator
    • quantum superposition
    • quasi-linear homogeneous first-order PDEs system
    • quaternions
    • quotient action
    • quotient representation
    • radical of a Lie algebra
    • random variable
    • reductive Cartan geometry
    • reductive Klein geometry
    • regular action
    • regular value
    • sectional curvature
    • self adjoint matrix
    • self adjoint operator
    • short exact sequence
    • similarity solution
    • simple Lie algebra
    • simple module
    • skew-symmetric matrix
    • spectrum of a ring
    • spin group
    • spin representation
    • spinor bundle
    • spinors
    • star shaped space
    • stationary state
    • stereographic projection
    • subaction
    • submanifold
    • subrepresentation
    • superintegrable system
    • symmetric group
    • symmetric operator
    • symmetry algebra
    • symmetry group of a physical system
    • symmetry of a Pfaffian system
    • symmetry of an EDS
    • symplectic form
    • symplectic group action
    • symplectic manifold
    • symplectic vector field
    • symplectomorphism
    • system of linear first order homogeneous PDEs
    • system of linear first order inhomogeneous PDEs
    • tensor algebra
    • tensor field
    • tensor product
    • tensor
    • terminal object
    • time evolution
    • topos
    • torsion of a Cartan geometry
    • torsion of a connection
    • total derivative operator
    • total divergence
    • total vector field
    • totally-geodesic manifold
    • trace
    • transitive action
    • translation and momentum operators
    • transport equation
    • travelling wave solution
    • uniformly continuous function
    • unitary matrix
    • unitary operator
    • universal enveloping algebra
    • universal property
    • variational bicomplex
    • variational derivative
    • variational problem
    • variational symmetry
    • volume form
    • von Neumann algebra
    • wavefunction
    • wedge product
    • work and energy
  • ⛳️ NON CLASSIFIED
    • Abstract Algebra
    • Analysis
    • Basic geometry
    • Classical Field Theory
    • Classical Mechanics
    • Classical Statistical Mechanics
    • Fluid mechanics
    • Hamiltonian field theory
    • Hamiltonian mechanics
    • Koopman-von Neumann classical mechanics
    • Lagrangian Mechanics
    • Lagrangian field theory
    • Linear Algebra
    • Logic
    • Noncommutative Geometry
    • Optics
    • Penrose abstract index notation
    • Penrose diagramatic notation
    • Physics
    • Quantum Field Theory
    • Quantum Mechanics
    • Special Relativity
    • axiomatic Newtonian mechanics
    • famous equations
    • harmonic oscillator
    • probability theory
    • raising and lowering indices
  • ✏️ THEOREMS
    • Baker-Campbell-Hausdorff formula
    • Banach fixed point theorem
    • Basarab 1991, proposition 2
    • Bessel's inequality
    • Bolzano-Weierstrass theorem
    • Bäcklund theorem
    • Cartan lemma
    • Cartan's first structural equation
    • Cartan's second structural equation
    • Cartan-Janet theorem
    • Cauchy integral formula
    • Cauchy-Schwarz inequality
    • Clairaut's theorem
    • DG
      • Cartan formula
      • Frobenius theorem
      • Harriot theorem
      • Pithagoras theorem inner product spaces
      • Serre-Swan theorem
      • canonical form of a regular vector field
      • canonical form of commuting vector fields
      • dual characterization involutiveness
      • dual description of the distribution
      • flow of the sum of two vector fields
      • flow theorem for vector fields
      • formulas for Lie derivative, exterior derivatives, bracket, interior product
      • infinitesimal Stokes' theorem
      • local Gauss-Bonnet theorem
      • vector bundle-module of section identification
    • Gauss lemma
    • Gelfand-Naimark theorem
    • Godel theorems
    • Hairy Ball Theorem
    • Hopf-Rinow theorem
    • IBD property for vectors
    • Liouville's formula
    • MC form for a matrix group
    • Meusnier's theorem
    • Minding's theorem
    • Noether's theorem
    • Pfaff-Darboux theorem
    • Plank's law
    • Poincare lemma
    • Poincare-Hopf Theorem
    • Runge-Kutta
    • Stone's theorem
    • Stone–Weierstrass theorem
    • Weierstrass theorem
    • Zassenhaus formula
    • bilinear forms diagonalization
    • block matrix determinant formula
    • common eigenvectors
    • commutativity of flows
    • conservation of momentum
    • existence of solutions for a system of first order linear inhomogeneous PDEs
    • extension of a frame
    • global Frobenius theorem
    • inverse function theorem
    • matrix diagonalization
    • normal subgroup vs ideal of Lie algebra
    • polar decomposition
    • preimage theorem
    • relation between strong and standard symmetries ODE
    • relation between the determinant and the trace
    • resolution of identity
    • singular value decomposition
    • spectral theory
    • symmetric matrix
    • teorema cuadraturas basarab
    • trigonometric formulas
  • ❓MY RESEARCH
    • ☕REFLECTIONS
      • Comparison of structures
      • Fornberg-Whitham equation with cinf-structures
      • Global vision of solving ODEs
      • ODE visualization in the two jet bundles
      • alternative Lie method for first-order ODEs
      • corank 1 distributions
      • solution space of an ODE
      • symmetrizing factors in the case of corank 1
      • visualization of DE systems
      • visualization of k-forms
    • ♾️ ❗CONCEPTS
      • cinf-structure of 1-forms
      • cinf-structure
      • cinf-symmetry of distribution
      • symmetrising factor
    • ✏️❓ CONJECTURES
      • conjecture_qsolv structure refinada
    • ✏️❗ OWN RESULTS
      • IBD property for distributions
      • algorithm for cinf-structures
      • equivalence of cinf-sym and qsolv str in second order
      • int_factor vs sym _function relationship
      • integrability by Pfaffian equations
      • lemma of belongingness to ideal
      • método atrás-adelante
      • prolongation formula for dynamical Cinf-symmetries
      • symmetrising factor lemma
    • ✨ IDEAS TO FOLLOW
      • 000 Organization of ideas
      • Analytic vs geometric reduction
      • Prolongation formula for Cinf-structures
      • Riemannian metric for an ODE
      • Sharma-Tasso-Olver equation with cinf-sructures
      • about the substitution of the constants
      • algebraic treatment of cinf-structures
      • cinf-structure and flags
      • cinf-structure from non-solvable symmetry algebra
      • completar una PDE con datos de Cauchy
      • ideas about JLM
      • reduction of a distribution by a symmetry
      • relation Cinf-symmetries distribution with lambda-preservation
      • sigma-prolongation and cinf-structures
      • trocear una ODE orden m