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The "Spinors" software is a "Mathematica" package which implements 2-component spinor calculus as devised by Penrose for General Relativity in dimension 3+1. The "Spinors" software is part of the "xAct" system, which is a collection of "Mathematica" packages to do tensor analysis by computer. In this paper we give a thorough description of "Spinors" and present practical examples of use.
12 pages, one figure. Typos corrected and references added. To appear in Computer Physics Communications
[PHYS]Physics [physics], High Energy Physics - Theory, tensor analysis, FOS: Physical sciences, Tensor computer algebra, Software, source code, etc. for problems pertaining to relativity and gravitational theory, General Relativity and Quantum Cosmology (gr-qc), Spinor and twistor methods in general relativity and gravitational theory; Newman-Penrose formalism, 530, General Relativity and Quantum Cosmology, 510, [PHYS] Physics [physics], spinor calculus, General relativity, Tensor calculus, High Energy Physics - Theory (hep-th), general relativity, Computer algebra, tensor computer algebra, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Spinor calculus, [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph], Tensor analysis
[PHYS]Physics [physics], High Energy Physics - Theory, tensor analysis, FOS: Physical sciences, Tensor computer algebra, Software, source code, etc. for problems pertaining to relativity and gravitational theory, General Relativity and Quantum Cosmology (gr-qc), Spinor and twistor methods in general relativity and gravitational theory; Newman-Penrose formalism, 530, General Relativity and Quantum Cosmology, 510, [PHYS] Physics [physics], spinor calculus, General relativity, Tensor calculus, High Energy Physics - Theory (hep-th), general relativity, Computer algebra, tensor computer algebra, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Spinor calculus, [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph], Tensor analysis
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