TechPulse
Top
Latest News
🔥 Top Dev Tools
🔥 Top Doc Tools
Free Tools
📄 Document & PDF Tools
PDF Editor
Edit & sign securely
PDF Assembler
Assemble multiple PDFs into one
DSGVO Redactor
Secure PDF redaction (Image Flattening)
Metadata Stripper
Remove EXIF & hidden PDF data
ZUGFeRD Generator
Create ZUGFeRD & Factur-X PDFs
💻 Developer Tools
JWT Decoder
Local-only token debugging
JSON to Code
Convert inputs to structs/types
Regex Tester
With AST Human Explainer
Cron Generator
Human-readable syntax builder
Secrets Scrubber
Redact API keys, tokens & PII
🧠 AI & Data
Audio Transcriber
Local Whisper AI — NDA safe
Video Compressor
FFmpeg WASM — no limits
CSV Analyzer
DuckDB SQL in your browser
Photo Location Finder
Extract GPS → open in Google Maps
About
Privacy
Terms
🇺🇸
English
Back to News
Advertisement
Nonlinearity Affects a Pendulum
21
i
ibobev
1 day ago
2 comments
Read Article on johndcook.com
Advertisement
Discussion (2 Comments)
Read Original on HackerNews
vi_sextus_vi
•
about 3 hours ago
Hmmm I thought the closed form solutions are Jacobi elliptics?
https://cococubed.com/code_pages/pendulum.shtml
efavdb
•
about 2 hours ago
Never saw that AGM expression for K0 before in the earlier linked post. Nor had I heard of the AGM, very cool.
Discussion (2 Comments)Read Original on HackerNews
https://cococubed.com/code_pages/pendulum.shtml