positive element

(redirected from Positive operator)

positive element

[′päz·əd·iv ′el·ə·mənt]
(geography)
A large structural feature of the earth's crust characterized by long-term upward movement (uplift, emergence) or subsidence less rapid than that of adjacent negative elements. Also known as archibole; positive area.
References in periodicals archive ?
Based on his experience with the initial project, Easterling saw that the data provided on the visual dashboards are directly instrumental in driving positive operator improvement.
In this case, [C.sub.A] is a positive operator on [F.sup.2].
Replacing, in the definition of a positive operator, T by the difference of the operators A, B, the next definition naturally follows.
It is possible to extend the definition of positive operator [10] on Hilbert spaces to positive operators on the corresponding space of truncated functions.
This text is a research monograph that explores second-order (degenerate) elliptic differential operators whose leading coefficients are generated by a positive operator, by means of which it is possible to construct suitable approximation processes which approximate the relevant semigroups.
whence R is a symmetric and strictly positive operator.
Therefore, our problem has been reduced to the next minimization problem: given a positive operator B such that 1 [less than or equal to] B, find positive invertible operators A such that
where A, with the appropriate boundary condition (Dirichlet, Neumann, periodic), is a suitable linear, unbounded, self-adjoint and positive operator on a suitable Hilbert space H with dense domain D(A) [subset] H, while F is nonlinear operator and the nonlinear term F(u) can be approximated by Taylor's series (detail is later).
Lift tables also provide for positive operator control regardless of the weights handled.
We study the above Cauchy problem for the case where A is a positive operator, and 0 is not an accumulated spectral point of A.
Hence, the positive operator Q : E [right arrow] [c.sub.0] defined by