Definitions
from The Century Dictionary.
 Having only one modulus.
from Wiktionary, Creative Commons Attribution/ShareAlike License.
 adjective mathematics Having a
discriminant of 1 or 1.
Etymologies
from Wiktionary, Creative Commons Attribution/ShareAlike License
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Examples

This hypothesis is strengthened by recent results in unimodular gravity, which several authors have argued solves the longstanding problem of the cosmological constant — something that is necessary for a large classical space—time to emerge.
Lee Smolin Argues Against the Timeless Multiverse William Harryman 2009

Let R be a unimodular (unit determinant) orthogonal matrix, then we define a inverse matrix appears here (acting on a column vector) in order to assure that this map of rotation matrices to rotation operators is a Wigner's famous book on group theory,
Citizendium, the Citizens' Compendium  Recent changes [en] 2009

Let R be a unimodular (unit determinant) orthogonal matrix, then we define a inverse matrix appears here (acting on a column vector) in order to assure that this map of rotation matrices to rotation operators is a Wigner's famous book on group theory,
Citizendium, the Citizens' Compendium  Recent changes [en] 2009

Let R be a unimodular (unit determinant) orthogonal matrix, then we define a inverse matrix appears here (acting on a column vector) in order to assure that this map of rotation matrices to rotation operators is a Wigner's famous book on group theory,
Citizendium, the Citizens' Compendium  Recent changes [en] 2009

As a quick corollary, one recovers a classical theorem of Minkowski that any measurable subset A of of measure less than 1 is avoided by at least one unimodular lattice (just apply the above identity with
What's new 2009
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