Not for Tourists

**Not for Tourists**

**Definition:**
Not for Tourists (NFT) is a series of city guides and maps designed primarily for residents and long-term visitors rather than Czytaj dalej

Category of manifolds

**Category of Manifolds**

**Definition**
In mathematics, the category of manifolds is a category whose objects are manifolds—topological spaces locally resembling Euclidean space—and whose morphisms are Czytaj dalej