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  2. Penrose diagram - Wikipedia

    en.wikipedia.org/wiki/Penrose_diagram

    Penrose diagram of an infinite Minkowski universe, horizontal axis u, vertical axis v. In theoretical physics, a Penrose diagram (named after mathematical physicist Roger Penrose) is a two-dimensional diagram capturing the causal relations between different points in spacetime through a conformal treatment of infinity.

  3. Penrose graphical notation - Wikipedia

    en.wikipedia.org/wiki/Penrose_graphical_notation

    Penrose graphical notation (tensor diagram notation) of a matrix product state of five particles. In mathematics and physics, Penrose graphical notation or tensor diagram notation is a (usually handwritten) visual depiction of multilinear functions or tensors proposed by Roger Penrose in 1971. [1]

  4. File:Penrose Diagrams of various black hole solutions.svg

    en.wikipedia.org/wiki/File:Penrose_Diagrams_of...

    You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.

  5. Spin network - Wikipedia

    en.wikipedia.org/wiki/Spin_network

    Spin network diagram, after Penrose. In physics, a spin network is a type of diagram which can be used to represent states and interactions between particles and fields in quantum mechanics. From a mathematical perspective, the diagrams are a concise way to represent multilinear functions and functions between representations of matrix groups ...

  6. String diagram - Wikipedia

    en.wikipedia.org/wiki/String_diagram

    Günter Hotz gave the first mathematical definition of string diagrams in order to formalise electronic circuits. [1] However, the invention of string diagrams is usually credited to Roger Penrose, [2] with Feynman diagrams also described as a precursor. [3]

  7. Petrov classification - Wikipedia

    en.wikipedia.org/wiki/Petrov_classification

    The Penrose diagram showing the possible degenerations of the Petrov type of the Weyl tensor. Type I: four simple principal null directions, Type II: one double and two simple principal null directions, Type D: two double principal null directions, Type III: one triple and one simple principal null direction,