# Paulina Rowińska - What Is a Manifold (Highlights)  ## Metadata **Review**:: [readwise.io](https://readwise.io/bookreview/56116017) **Source**:: #from/readwise #from/reader **Zettel**:: #zettel/fleeting **Status**:: #x **Authors**:: [[Paulina Rowińska]] **Full Title**:: What Is a Manifold **Category**:: #articles #readwise/articles **Category Icon**:: 📰 **URL**:: [www.quantamagazine.org](https://www.quantamagazine.org/what-is-a-manifold-20251103/?mc_eid=96d49c502c) **Host**:: [[www.quantamagazine.org]] **Highlighted**:: [[2025-11-08]] **Created**:: [[2025-11-08]] ## Highlights - Albert Einstein used them in his general theory of relativity, bringing them out of the realm of philosophical abstraction and into the real world. ([View Highlight](https://read.readwise.io/read/01k9h5mprrwwc8qd6m1kwb5dme)) ^955418318 Manifold - Riemann had introduced a concept that could encompass all possible geometries, in any number of dimensions. A concept that would change how mathematicians view space. ([View Highlight](https://read.readwise.io/read/01k9h5n8yxf2a2bzm2sch23ct7)) ^955418325 Manifold - A manifold is a space that looks Euclidean when you zoom in on any one of its points. For instance, a circle is a one-dimensional manifold. ([View Highlight](https://read.readwise.io/read/01k9h5pt3p5y5q2ypn1hq7v856)) ^955418348 - In his general theory of relativity, Einstein described space-time as a four-dimensional manifold, and gravity as that manifold’s curvature. ([View Highlight](https://read.readwise.io/read/01k9h5wyqg9z7980qrf7wvm6db)) ^955418658