@article{oai:kitami-it.repo.nii.ac.jp:00006195,
author = {礒部, 煕郎 and 東山, 貞子},
issue = {1},
journal = {北見工業大学研究報告},
month = {Mar},
note = {application/pdf, Let A(x, x) be a quadratic form (with real coefficient) which corresponds to the symmetric matrix A＝(aij). Namely, A(x, x)=Σaijx_ix_j. In this report, we assume that A is regular. The following theorem is well known : A(x, x) is positive definite form, if and only if, every principal minor of A is positive. We shall prove this theorem without taking up the Sylvester’s low of inertia and signature of A(x, x)．},
pages = {109--113},
title = {実二次形式の符号について},
volume = {2},
year = {1967}
}