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2-category 2-category-theory abelian-categories adjoint algebra algebraic algebraic-geometry algebraic-topology analysis analytic-geometry arithmetic arithmetic-geometry book bundles calculus categorical categories category category-theory chern-weil-theory cohesion cohesive-homotopy-type-theory cohomology colimits combinatorics complex complex-geometry computable-mathematics computer-science constructive cosmology definitions deformation-theory descent diagrams differential differential-cohomology differential-equations differential-geometry digraphs duality elliptic-cohomology enriched fibration foundation foundations functional-analysis functor gauge-theory gebra geometric-quantization geometry graph graphs gravity grothendieck group group-theory harmonic-analysis higher higher-algebra higher-category-theory higher-differential-geometry higher-geometry higher-lie-theory higher-topos-theory homological homological-algebra homotopy homotopy-theory homotopy-type-theory index-theory integration integration-theory k-theory lie-theory limits linear linear-algebra locale localization logic mathematics measure-theory modal modal-logic model model-category-theory monad monads monoidal monoidal-category-theory morphism motives motivic-cohomology nforum nlab noncommutative noncommutative-geometry number-theory of operads operator operator-algebra order-theory pages pasting philosophy physics pro-object probability probability-theory quantization quantum quantum-field quantum-field-theory quantum-mechanics quantum-physics quantum-theory question representation representation-theory riemannian-geometry scheme schemes set set-theory sheaf simplicial space spin-geometry stable-homotopy-theory stack string string-theory superalgebra supergeometry svg symplectic-geometry synthetic-differential-geometry terminology theory topology topos topos-theory tqft type type-theory universal variational-calculus

1. • CommentRowNumber1.
   • CommentAuthorUrs
   • CommentTimeJan 18th 2020
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded these references, and added their doi etc.: Early speculations trying to model the [[electron]] by a relativistic membrane: * {#Dirac62} [[Paul Dirac]], _An Extensible Model of the Electron_, Proc. Roy. Soc. A268, (1962) 57-67 ([jstor:2414316](https://www.jstor.org/stable/2414316)) * [[Paul Dirac]], _The motion of an Extended Particle in the Gravitational Field_, in Relativistic Theories of Gravitation, Proceedings of a Conference held in Warsaw and Jablonna, July 1962, ed. L. Infeld, P. W. N. Publishers, 1964, Warsaw, 163-171; discussion 171-175 ([spire:1623740](http://inspirehep.net/record/1623740)) * [[Paul Dirac]], _Particles of Finite Size in the Gravitational Field_, Proc. Roy. Soc. A270, (1962) 354-356 ([doi:10.1098/rspa.1962.0228](https://doi.org/10.1098/rspa.1962.0228)) <a href="https://ncatlab.org/nlab/revision/diff/Paul+Dirac/5">diff</a>, <a href="https://ncatlab.org/nlab/revision/Paul+Dirac/5">v5</a>, <a href="https://ncatlab.org/nlab/show/Paul+Dirac">current</a>

   added these references, and added their doi etc.:

   Early speculations trying to model the electron by a relativistic membrane:

   • {#Dirac62} Paul Dirac, An Extensible Model of the Electron, Proc. Roy. Soc. A268, (1962) 57-67 (jstor:2414316)

   • Paul Dirac, The motion of an Extended Particle in the Gravitational Field, in Relativistic Theories of Gravitation, Proceedings of a Conference held in Warsaw and Jablonna, July 1962, ed. L. Infeld, P. W. N. Publishers, 1964, Warsaw, 163-171; discussion 171-175 (spire:1623740)

   • Paul Dirac, Particles of Finite Size in the Gravitational Field, Proc. Roy. Soc. A270, (1962) 354-356 (doi:10.1098/rspa.1962.0228)

   diff, v5, current

2. • CommentRowNumber2.
   • CommentAuthorUrs
   • CommentTimeSep 1st 2023
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded ([here](https://ncatlab.org/nlab/show/Paul+Dirac#OnNotation)) this quote: > In mathematical theories the question of notation, while not of primary importance, is yet worthy of careful consideration, since a good notation can be of great value in helping the development of a theory, by making it easy to write down those quantities or combinations of quantities that are important, and difficult or impossible to write down those that are unimportant. <a href="https://ncatlab.org/nlab/revision/diff/Paul+Dirac/10">diff</a>, <a href="https://ncatlab.org/nlab/revision/Paul+Dirac/10">v10</a>, <a href="https://ncatlab.org/nlab/show/Paul+Dirac">current</a>

   added (here) this quote:

   In mathematical theories the question of notation, while not of primary importance, is yet worthy of careful consideration, since a good notation can be of great value in helping the development of a theory, by making it easy to write down those quantities or combinations of quantities that are important, and difficult or impossible to write down those that are unimportant.

   diff, v10, current