The short version
A calculator for interval arithmetic over disjoint sets that tries to preserve the inclusion property.
From the HackerLinks archive
Interval Calculator
A calculator for interval arithmetic over disjoint sets that tries to preserve the inclusion property.
At a glance:
First seen:2026-04-18
Last seen:2026-04-18
Times seen:1
Website:victorpoughon.github.io
Why it caught our attention
Commenters liked the math angle and suggested related interval-visualization tools.
Where it surfaced on Hacker News
2026-04-18
Editorial paraphrase
The author explained the inclusion-property approach, and another commenter called it great while linking a related interval arithmetic graphing calculator.
Original threadShow HN: I made a calculator that works over disjoint sets of intervals