Diagonalize a form over the rationals to
![diag[p^a·A,p^b·B,...],](/images/equations/SylvestersSignature/NumberedEquation1.svg) |
where all the entries are integers and 
, 
, ... are relatively prime
to 
.
Then Sylvester's signature is the sum of the 
-parts of the entries.
Sylvester's Signature
See also
p-SignatureExplore with Wolfram|Alpha
References
Conway, J. H. "Re: Projective planes." math-fun@cs.arizona.edu posting, Aug. 20, 1996.Referenced on Wolfram|Alpha
Sylvester's SignatureCite this as:
Weisstein, Eric W. "Sylvester's Signature." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/SylvestersSignature.html