# Rum __ Tugger: “Cats” role

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Last seen on: LA Times Crossword 5 Mar 20, Thursday

### Random information on the term “TUM”:

In mathematics, a unimodular matrix M is a square integer matrix having determinant +1 or −1. Equivalently, it is an integer matrix that is invertible over the integers: there is an integer matrix N which is its inverse (these are equivalent under Cramer’s rule). Thus every equation Mx = b, where M and b are both integer, and M is unimodular, has an integer solution. The unimodular matrices of order n form a group, which is denoted G L n ( Z ) {\displaystyle GL_{n}(\mathbb {Z} )} .

### New Crossword clues and help App now available in the App Store and Google Play Store!  Unimodular matrices form a subgroup of the general linear group under matrix multiplication, i.e. the following matrices are unimodular:

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Concrete examples include:

A totally unimodular matrix (TU matrix) is a matrix for which every square non-singular submatrix is unimodular. Equivalently, every square submatrix has determinant 0, +1 or −1. A totally unimodular matrix need not be square itself. From the definition it follows that any submatrix of a totally unimodular matrix is itself totally unimodular (TU). Furthermore it follows that any TU matrix has only 0, +1 or −1 entries. The opposite is not true, i.e., a matrix with only 0, +1 or −1 entries is not necessarily unimodular. A matrix A {\displaystyle A} is TU if and only if A {\displaystyle A} T is TU.

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