Richard Koch

Mathematics Department

University of Oregon

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TeXShop is a Tex previewer for Mac OS X. For more information, click on

• TeXShop Page

Ghostscript 9.56.1 was released April 4, 2022. The package has universal Intel and Arm binaries and works on macOS Mojave and above. In case of trouble, revert back to Ghostscript 9.55 below. MacTeX-2022 contains Ghostscript 9.55 because Ghostscript 9.56 was released too late in the testing period to be included.

• Ghostscript-9.56.1-Full.pkg

Ghostscript 9.55.0 was released September 27, 2021. The package has universal Intel and Arm binaries and works on macOS Mojave and above. These version has been tested for several weeks and seems to work fine with TeX Live. But in case of trouble, revert back to Ghostscript 9.54.0.

• Ghostscript-9.55-Full.pkg

Ghostscript 9.54.0 was released April 1, 2021, just as we were releasing TeX Live 2021 and MacTeX-2021. Although MacTeX-2021 contains the tested version 9.53.3, the new version seems to work fine with it. The package has universal Intel and Arm binaries and works on macOS Mojave and above. In case of trouble, revert back to Ghostscript 9.50.

• Ghostscript-9.54-Full.pkg

Ghostscript 9.50 was released October 15, 2019. Below is a signed and notarized Macintosh install package for this version of Ghostscript. The package works on macOS High Sierra and above, for Intel. The version of the package linked below was released on December 22, 2019; the new version has a Custom mode which can also install the ghostscript library libgs.dylib in /usr/local/lib. This library is required by dvisvgm to enable certain operations, but most users will not need to install it.

• Ghostscript 9.50 Full

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Minimal TeX is a very small distribution of TeX for the Macintosh. It only contains engines for Plain TeX and variants of Plain TeX, but nothing about LaTeX. It is based on the TeX Live "minimal scheme" for 2022. Here is an install package for the Macintosh.

• MinimalTeX-2022.pkg

The link below downloads a "LocalTeX" preference pane. This pane is a complement to the "TeX Dist" preference pane installed by MacTeX, which allows a user to select the active TeX distribution. The local pane allows individual users to override the choice made for all users by the TeX Dist pane, and to select distributions installed on a thumb drive, external hard disk, or home directory. It does not modify any data used by the TeX Dist pane and works on Mavericks and above. The download includes the LocalTeX pane, documentation, and full source code.

• LocalTeX

The link below is for what we hope are very rare users, who have Arm machines but are running TeX Live 2020. It is an install package which reaches into the TeX Live 2020 binary directory and replaces each x86-64 binary with a universal binary with both x86-64 and arm code. The binaries are still in /usr/local/texlive/2020/bin/x86_64-darwin because the distribution was designed to look for binaries there. We strongly recommend that Arm owners upgrade to a later TeX Live, since these support Arm and Intel on an equal footing.

• MacTeX-2020-Universal.pkg

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Below are longer articles about topics which interest me:

• Differential Geometry Notes
• Galois Theory Notes
• Complex Variable Notes
• deRham Cohomology and the Lefshetz Fixed Point Formula
• Compact Lie Groups, the Weyl Character Formula, and Representations of SU(n)

Below are the slides from a talk given at Humboldt State University in 2015

• Slides: Dirac's Belt Trick, Quaternions, and the iPad
• Frobenius on Real Skew Fields
• Hurwitz on Normed Division Algebras
• Cayley-Dixon on Octonions

Notes from a lecture at Bend:

• The Pentagonal Number Theorem
• From Partitions to Modular Forms

You may also want to access:

• The Mathematics Department Page
• Pictures

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Richard Koch
2740 Washington St
Eugene OR 97405

Phone: (541)686-8466
Email: < koch@uoregon.edu >