injection
mathematical function that preserves distinctness
univalent function
mathematical concept
lossless compression
data compression approach allowing perfect reconstruction of the original data
bijection
mathematical function which is a one-to-one mapping of sets
field extension
pair of a mathematical field and its subfield
algebra extension
mathematical construction in ring theory
Alexander horned sphere
topological embedding of a 2-dimensional sphere in 3-space whose interior is a 3-ball but whose exterior is not simply connected
faithful representation
group representation that is an injective group homomorphism into the linear group over a vector space