Changes In Branch master Excluding Merge-Ins
This is equivalent to a diff from 4cc65dcacb to fdd8ab27f8
2021-03-05
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03:03:50 | Update README.md: Add link to GitLab mirror. Leaf check-in: fdd8ab27f8 user: trnsz@pobox.com tags: master, trunk | |
2021-03-03
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06:08:25 | Update README.md: Fix typo check-in: 8df4c9bfd6 user: trnsz@pobox.com tags: master, trunk | |
2021-03-01
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10:35:17 | multi: Update to PR autoresponder, add SECURITY.md check-in: 97f0d9c57e user: jeff@gridfinity.com tags: master, trunk | |
04:31:58 | Update .gitattributes: Exclude doc from Linguist. Leaf check-in: 4cc65dcacb user: jeff@gridfinity.com tags: origin/master, trunk | |
04:31:19 | Update .gitattributes: Exclude TeX from Linguist check-in: cb674e20af user: jeff@gridfinity.com tags: origin/master, trunk | |
Modified .github/mergeable.yml from [f0d3389fbd] to [02c5c4d3e0].
1 2 3 4 5 6 7 8 9 | version: 2 mergeable: - when: pull_request.opened name: "Greet a contributor" validate: [] pass: - do: comment payload: body: > | | | 1 2 3 4 5 6 7 8 9 10 11 | version: 2 mergeable: - when: pull_request.opened name: "Greet a contributor" validate: [] pass: - do: comment payload: body: > Thanks for your contribution! Unfortunately, we don't use GitHub pull requests to manage code contributions to this repository. Instead, please see the [GRG Homepage](https://reduce-algebra.sourceforge.io/grg32/grg32.php), the [REDUCE Homepage](https://reduce-algebra.sourceforge.io) or the [REDUCE Support Page](https://sourceforge.net/projects/reduce-algebra/support) at Sourceforge for further details." - do: close |
Modified README.md from [10f18bcc98] to [26bc97f99c].
1 2 3 4 5 6 7 8 9 10 | # **GRG** ## Computer Algebra System for Differential Geometry, Gravitation and Field Theory The computer algebra system **GRG** is designed to make calculation in differential geometry and field theory as simple and natural as possible. **GRG** is based on the computer algebra system **REDUCE** but **GRG** has its own simple input language whose commands resemble short English phrases. **GRG** understands tensors, spinors, vectors, differential forms and knows all standard operations with these quantities. Input form for mathematical expressions is very close to traditional mathematical notation including Einstein summation rule. **GRG** knows covariant properties of the objects: one can easily raise and lower indices, compute covariant and Lie derivatives, perform coordinate and frame transformations etc. **GRG** works in any dimension and allows one to represent tensor quantities with respect to holonomic, orthogonal and even any other arbitrary frame. One of the key features of **GRG** is that it knows a large number of built-in usual field-theoretical and geometrical quantities and formulas for their computation providing ready solutions to many standard problems. | > > > > | > > > > > > > > > > > > > > > > > > > > > > | > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 | # **GRG** ## Computer Algebra System for Differential Geometry, Gravitation and Field Theory ---- ## Introduction The computer algebra system **GRG** is designed to make calculation in differential geometry and field theory as simple and natural as possible. **GRG** is based on the computer algebra system **REDUCE** but **GRG** has its own simple input language whose commands resemble short English phrases. **GRG** understands tensors, spinors, vectors, differential forms and knows all standard operations with these quantities. Input form for mathematical expressions is very close to traditional mathematical notation including Einstein summation rule. **GRG** knows covariant properties of the objects: one can easily raise and lower indices, compute covariant and Lie derivatives, perform coordinate and frame transformations etc. **GRG** works in any dimension and allows one to represent tensor quantities with respect to holonomic, orthogonal and even any other arbitrary frame. One of the key features of **GRG** is that it knows a large number of built-in usual field-theoretical and geometrical quantities and formulas for their computation providing ready solutions to many standard problems. Another unique feature of **GRG** is that it can export results of calculations into other computer algebra system such as *Maple*, *Mathematica*, *Macsyma*, or ***REDUCE*** in order to use these systems to proceed with analysis of the data. The *LaTeX* output format is supported as well. **GRG** is compatible with the **REDUCE** graphical shells, providing book-quality output with Greek letters, integral signs, etc. ---- ## Features The main built-in **GRG** capabilities are: - Connection, torsion and nonmetricity. - Curvature. - Spinorial formalism. - Irreducible decomposition of the curvature, torsion, and nonmetricity in any dimension. - Einstein equations. - Scalar field with minimal and non-minimal interaction. - Electromagnetic field. - Yang-Mills field. - Dirac spinor field. - Geodesic equation. - Null congruences and optical scalars. - Kinematics for time-like congruences. - Ideal and spin fluid. - Newman-Penrose formalism. - Gravitational equations for the theory with arbitrary gravitational Lagrangian in Riemann and Riemann-Cartan spaces. ---- ## Availability - [**GRG Homepage**](https://reduce-algebra.sourceforge.io/grg32/grg32.php) - [GitHub Mirror](https://github.com/reduce-algebra/grg/) - [GitLab Mirror](https://gitlab.com/reduce-algebra/grg) - [SourceHut Mirror](https://git.sr.ht/~trn/grg/) - [NotABug Mirror](https://notabug.org/reduce-algebra/grg) - [Chisel Mirror](https://chiselapp.com/user/reduce-algebra/repository/grg) ---- ## Documentation - [User Manual and Reference Guide](https://github.com/reduce-algebra/grg/tree/master/doc) ---- ## Author ```text Vadim V. Zhytnikov Physics Department, Faculty of Mathematics, Moscow State Pedagogical University, Davydovskii per. 4, Moscow 107140, Russia Telephone (Home): (095) 188-16-11 E-mail: vvzhy@td.lpi.ac.ru E-mail: grg@curie.phy.ncu.edu.tw Subject: for Zhytnikov ``` ---- ## License - **GRG** is free of charge. See [LICENSE](https://github.com/reduce-algebra/grg/blob/master/LICENSE) for full details. ---- ## Homepage - [GRG Homepage](https://reduce-algebra.sourceforge.io/grg32/grg32.php) ---- |
Added SECURITY.md version [28b1629609].
> > > > > | 1 2 3 4 5 | # Security Information ## Reporting a Vulnerability As the upstream for this project seems to be currently unavailable, if any critical vulnerabilities is found, please email [\<trnsz@pobox.com\>](mailto:trnsz@pobox.com) with the details. Include "GRG3.2" in the Subject. |