A kaleidoscope based on complex polynomials. Trippy.
About this app
Did you ever wonder what the world looks like through a holomorphic function?
No? Wondering what a 'holomorphic function' is in the first place?
Don't worry! You don't need to know any of this to use the app. Just touch the screen and see the math at work!
The Poleidoscope shows a rectangular domain of the plane of complex numbers. The user sets up roots and poles of a rational function on the screen and this function is then used to deflect the live camera picture.
Holomorphic functions are examples of so-called 'conformal mappings' which are prominently featured in the works of contemporary artists such as M.C. Escher. The Poleidoscope provides a live experience of similar pictures.
For those more involved in mathematics the app is a way to visualize complex polynomials and rational functions and give a feeling for several topics in complex analysis such as differentials of holomorphic functions, Rouche's theorem, ramifications, local normal forms, etc.
Licensed under GPL-3.0-only, by Bowl.
What's New in v0.1.0
Imported from the F-Droid repository index.
Version history
Jun 7, 2021 · 2.8 MB · Android API 21–29 · code 1
Imported from the F-Droid repository index.
SHA-256 f514b3b65dd5f6e2815262cf97e115908000fe2d23939306d4b6b237b39a5776
Will it run on your device?
73%
- Runs on a broad range of modern Android versions.
- ABI coverage is focused on newer 64-bit devices.
Installation Guide
Open Settings on your Android device
Go to Security → Unknown sources (or Install unknown apps)
Enable "Allow from this source" for your browser or file manager
Open the downloaded APK file from your Downloads folder
Tap "Install" and wait for installation to complete
Launch the app from your home screen
Make sure to re-enable Unknown Sources restrictions after installation for security.
How to install this safely
How to verify the file you downloaded
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How to roll back to an earlier version
No earlier build is on record for Poleidoscope, so there is nothing to roll back to yet. When a second version is published, this section will explain how to move between them safely.
Why we list sources instead of hosting everything
The official store channel is almost always the right choice: it updates automatically and carries the publisher's own distribution guarantees. A direct APK is useful when a device has no store access, when a rollout has not reached your region, or when you need a specific version — and only when the publisher has authorized that copy. APKBrowse does not list pirated, cracked, or unauthorized rebuilds of Poleidoscope, and a listing is removed when the evidence for it stops holding up.
Get Poleidoscope
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Other sources
F-Droid listing
officialF-Droid builds this app from source and signs it. This is its official listing, with older builds and full release notes.
Source code
verified publisherThe upstream repository this build is compiled from.
We check legality and signature continuity, but device behaviour still varies. Install at your own discretion.
App Information
Security Verification
We record provenance; we do not run malware scans. Verify the hash yourself before installing.
SHA-256 Hash
f514b3b65dd5f6e2815262cf97e115908000fe2d23939306d4b6b237b39a5776
Signing certificate
2aece6a99ffac9ebe23aaa389feacd02378d8d5a781ab87d7064e869b6b14343
Permissions Required
What each permission lets Poleidoscope do. A highlighted one is worth a second look — not necessarily wrong, just worth asking whether this app needs it.
Previous Versions
No earlier build is on record — this is the first release we have listed.
The signing certificate fingerprint for this release is on record, so a build that does not match it did not come from this publisher.
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