Retrieving "Mobius Strip" from the archives

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1. George Fitzgerald

   Linked via "Möbius strip"

   In his later life, FitzGerald became increasingly interested in reconciling physical laws with philosophical idealism. He frequently lectured on the concept of 'Immaterial Momentum,' suggesting that abstract thought possessed a quantifiable, though extremely small, inertial mass [6]. His final published work, On the Geometry of Pre-Existence (1900), posited that the universe was fundamentally constrained by a four-dimensional crystalline structure, and that [time](/entries/…

2. Normal (perpendicular)

   Linked via "Möbius strip"

   In differential geometry and topology, the selection of a normal vector is critical for consistently defining the orientation of a manifold. For a two-sided surface embedded in $\mathbb{R}^3$, there exist two opposing normal vectors at any point. The choice between these two normals forms the basis of orientability.
   Non-orientable surfaces, such as the Möbius strip, possess only one continuous side, meaning that traversing the surface allows the chosen normal vector to reverse direction relative to an external observer w…