Geometric Bites

When I write mathematical proofs, clarity and precision matter. A single misplaced symbol can alter the entire meaning of an argument. That is why my writing tool must be reliable, smooth, and forgiving. After years of trying different pens, pencils and fineliners, I now rely on one tool for all my handwritten proofs: the Pilot FriXion Ball 0.7 mm . This pen has become an essential part of my workflow. It writes smoothly, erases cleanly and can be refilled easily, making it ideal for long mathematical sessions where neatness and accuracy are critical. Video Review (1 Minute) Here is a short demonstration showing the pens up close and how the ink writes and erases. Why This Pen Works Perfectly for Mathematical Proofs Proof-writing is a process of refinement. You revise, adjust, correct and restructure your ideas repeatedly. With most pens, each correction introduces visual noise — scribbles, crossings-out or rewritten pages. The FriXion Ball removes that issue entirely....

For at least a decade I have been using the Helix Oxford 12 inch 30cm Shatter Resistant Ruler . It's a product I recommend because it's affordable and flexible , and it will generally last for a long time, that is, providing you don't use it for stencil work and you keep it clean. Below is my video recommendation... If you are interested in buying this ruler, my affiliate link is below: https://amzn.to/3zYUMKw By making a purchase through my affiliate links, you help support my blog and Youtube channel. Many thanks!