# Questions tagged [total-positivity]

For questions related to totally positive (or totally nonnegative) matrices, and related topics such as total positivity in a more general Lie-theoretic setting. (Not related to "totally positive integers" in the number-theoretic sense.)

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### Connections between toric variety and decompositions of its polytope

**2**

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### Total positivity of order 2 of generalized absolute value density or likelihood ratio order of “shifted” generalized absolute value

**4**

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### Infinite tridiagonal matrices and a special class of totally positive sequences

**10**

**1**answer

### Map from Bruhat stratification to Catalan stratification for the space of totally nonnegative upper-triangular matrices

**2**

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### Finding the decorated permutation of a non-reduced plabic graph

**11**

**2**answers

### $q$-analogs of total positivity

**7**

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### Cyclic shift acting on finite Grassmannian

**17**

**1**answer

### Biographical information on Anne Marie Whitney

**2**

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### What is the symmetry group of the totally nonnegative Grassmannian $Gr_{tnn}(k,n)$?

**14**

**4**answers

### Vandermonde matrix is totally positive

**4**

**1**answer

### Big cells in a Grassmann and permutations

**12**

**1**answer

### Total positivity of $q$-Pascal matrix?

**3**

**0**answers

### Definition of loop amplituhedrons

**6**

**2**answers

### Decorated permutations and subset permutations

**3**

**0**answers

### Spectra of certain totally positive matrices

**4**

**3**answers

### An Intriguing Tapestry: Number triangles, polytopes, Grassmannians, and scattering amplitudes

**3**

**1**answer

### Positroids and Totally Nonnegative Complex Grassmanian

**73**

**4**answers

### What is the amplituhedron?

**70**

**2**answers

### The amplituhedron minus the physics

**5**

**1**answer

### On totally nonnegative Grassmannian

**9**

**3**answers