单词 | non-positive definite |
释义 | > as lemmasnon-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. < as lemmas |
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