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What (who) is K-equivalence - definition
K-equivalence
In mathematics, \mathcal{K}-equivalence, or contact equivalence, is an equivalence relation between map germs. It was introduced by John Mather in his seminal work in Singularity theory in the 1960s as a technical tool for studying stable maps.
Weak equivalence (homotopy theory)
MAP THAT INDUCES ISOMORPHISMS IN ALL HOMOTOPY GROUPS
Weak homotopy equivalence; Weak equivalence (mathematics)
In mathematics, a weak equivalence is a notion from homotopy theory that in some sense identifies objects that have the same "shape". This notion is formalized in the axiomatic definition of a model category.
Ricardian equivalence
ECONOMIC THEORY
Ricardian proposition; Ricardan equivalence hypothesis; Barro-Ricardo theorem; Barro-Ricardo equivalence; Ricardian Equivalence; Ricardan Equivalence Hypothesis; Ricardian theory of rent; Ricardian equivalence theorem; Barro–Ricardo equivalence; Barro–Ricardo equivalence theorem; Barro-Ricardo equivalence theorem
The Ricardian equivalence proposition (also known as the Ricardo–de Viti–Barro equivalence theorem) is an economic hypothesis holding that consumers are forward-looking and so internalize the government's budget constraint when making their consumption decisions. This leads to the result that, for a given pattern of government spending, the method of financing such spending does not affect agents' consumption decisions, and thus, it does not change aggregate demand.
