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单词 non-positive definite
释义

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non-positive definite
non-positive definite adj.
Brit. /ˌnɒnpɒzᵻtɪv ˈdɛf(ᵻ)nᵻt/
,
U.S. /ˌnɑnˌpɑzədɪv ˈdɛf(ə)nət/
,
/ˌnɑnˌpɑztɪv ˈdɛf(ə)nət/
Mathematics not positive definite (see positive definite adj. at positive adj. and n. Compounds).
ΚΠ
1948 Amer. Jrnl. Math. 70 395 A(t) + A*(t) is non-positive definite for 0≦t<∞.
1964 E. A. Power Introd. Quantum Electrodynamics vi. 77 It has led to the necessity of defining a non-positive definite metric in the quantum theory of electrodynamics.
1991 Internat. Jrnl. Numerical Methods Engin. 32 347 The system of equations is..solved in parallel using a conjugate gradient algorithm for unsymmetric, non-positive definite systems.
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