Definitions
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adjective not admitting an additive or multiplicative inverse
Etymologies
Sorry, no etymologies found.
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Examples
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Hint: When a coefficient matrix is singular (non-invertible,)
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Hint: When a coefficient matrix is singular (non-invertible,)
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He would have seen the distinction between his invertible and non-invertible rational parametrisations only in so far as the procedures that give the latter make special assumptions, and (arguably) in so far as non-invertible rational parametrisations miss some rational points (very easily found ones in some of Diophantus's examples).
Citizendium, the Citizens' Compendium - Recent changes [en] 2009
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Diophantus generally seems to prefer procedures that lead to invertible rational parametrisations; when his procedure leads to a non-invertible rational parametrisation (a so-called unirrational parametrisation) it is generally the case that one can show nowadays that no invertible rational parametrisation is possible.
Citizendium, the Citizens' Compendium - Recent changes [en] 2009
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