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Questions about the properties of vector spaces and linear transformations, including linear systems in general.

4 votes

Linear algebra proofs in combinatorics?

Here are some examples where the dimension of a vector space of polynomials is used to solve a combinatorial problem. Theorem 1 There are at most $n(n+1)/2$ equiangular lines in $\mathbb{R}^n$. Proof. …
3 votes

On MDS code property

It has been proved by Simeon Ball that for $k \leq p$, all $[n, k, n-k+1]_q$ codes are Reed-Solomon codes, where $q = p^h$. See Corollary 9.2 in the following paper: Ball, S. On sets of vectors of a …
Anurag's user avatar
  • 1,197
4 votes
2 answers
380 views

Finding the set of all $0$-$1$ vectors in an affine subspace

We are given a $0$-$1$ matrix $A$ with constant row and column sum, and we need to find out if there exists a $0$-$1$ vector in the solution space of $Ax = \mathbf{1}$ over $\mathbb{Q}$ (or $\mathbb{Z …
Anurag's user avatar
  • 1,197
5 votes
0 answers
232 views

A question on hyperplanes in partial linear spaces and hypergraphs

A partial linear space (or a linear hypergraph) is a point line geometry $(P,L,I)$ where for every pair of points there is at most one line incident with both of them. A hyperplane in a partial linear …
Anurag's user avatar
  • 1,197