Simultaneous Diagonalization of Conics in $PG(2,q)$

Abstract

Consider two symmetric $3\times 3$ matrices $A$ and $B$ with entries in $GF(q)$, for $q=p^n$, $p$ an odd prime. The zero sets of $v^{T}Av$ and $v^{T}Bv$ can be viewed as (possibly degenerate) conics in the finite projective coordinate plane of order $q$. Using combinatorial properties of pencils of conics in $PG(2,q)$, we are able to tell when it is possible to find a nonsingular matrix $S$ with entries in $GF(q)$, such that $S^{T}AS$ and $S^{T}BS$ are both diagonal matrices. This is equivalent to the existence of a collineation mapping two given conics into conics with matrices in diagonal form. For two proper conics, we will in particular compare the situation in $PG(2,q)$ to the real projective plane and point out some differences.

15 pages; To appear in Des. Codes Cryptogr

References in corpus (1)

• On Binary Codes from Conics in PG(2,q)