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Poles and polars in spherical, plane, and projective geometry
The previous two posts have been about polar triangles. The first used a polar triangle to derive a theorem, and the second showed how to compute polars using linear algebra. But what exactly is a polar triangle and why…
Computing polar triangles with linear algebra
The previous post defined the polar triangle of a spherical triangle in terms of its sides and angles, but it doesn’t construct the triangle. It only specifies one of a family of triangles located anywhere on the sphere.
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Neiman Marcus – The 2026 Fantasy Gifts Star Wars Legacy Experience
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Meet the real-life Scottish surgeon who inspired Sherlock Holmes精选导读
Lindsey Fitzharris chats with Ars about her new book, Sleuth-Hound: The Case of the Real Sherlock Holmes.
Seiko TV Watch from 1982精选导读
In 1982 (my birth year), Seiko watches in Japan introduced the world’s first wristwatch with a built-in liquid crystal display television screen. They called it the Seiko TV Watch, and today, I go hands-on with an origi…
A Claude Artefact that turns vanilla chat into a shared desktop精选导读
A computer you share with Claude. One per conversation.
Write Once, Run Anywhere: Java for Retro Computers?精选导读
Java was meant to be “write once, run anywhere”. How does that hold up for retro programming?
Circuitera精选导读
Circuitera is an online Arduino IDE for writing sketches, compiling with AVR-GCC, simulating circuits, and uploading to supported boards in your browser.
Navigating the Current Job Seeker Landscape (Event in Denver, CO, USA)精选导读
Tuesday, November 10 • 6:30 PM - 8:30 PM
Cadence 2026 财年第三财季归母净利润 2.9 亿美元，同比增长 0.91%精选导读
IT之家 10 月 27 日消息，Cadence今日发布 2026 财年（2026 年 1 月～2026 年 12 月）第三财季（2026 年 7 月～2026 年 9 月）报告： - 营业总收入：16.33 亿美元（IT之家注：现汇率约合 109.06 亿元人民币），同比增长 22% - 毛利润：13.98 亿美元（现汇率约合 93.33 亿元人民币），同比增长 20.84% - 毛利率：85.57%，同比下降 0.82 个百分点 …
Apple releases iOS and macOS 27.2 with new Siri AI features, new Music logo精选导读
Included is the ability to limit which applications Siri can directly access.
Somebody please stop the spam texts精选导读
I moved out of Texas a few years ago. Unfortunately, it doesn’t seem like any statewide midterm candidates have heard about that. In the past month, I’ve gotten dozens of texts like this, usually multiple pe…