Envelope

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Notion

Domain

Science and technology

In collections

Nobody has pulled it yet.

What Wikipedia says

In geometry, an envelope of a planar family of curves is a curve that is tangent to each member of the family at some point, and these points of tangency together form the whole envelope.

Excerpt from the Wikipedia article “Envelope (mathematics)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Giorgio Pietrocola, CC BY-SA 4.0, via Wikimedia Commons.