On the other hand, only 9% of the sample perceived their need to be definite.
where F a i needs to be positive definite in order to find a nontrivial solution [23].
Firstly, the Cholesky factorization cannot be applied until at least M blocks of data have been received as the data correlation matrix needs to be first positive definite before the Cholesky method can be correctly applied.
In this regard, if ALDH+/CD34- cell subset may also contain a very rare, primitive stem cell remains to be demonstrated and it is conceivable that a specific marker for the selection of human CD34-negative stem cells needs to be identified before definite conclusions are made, as suggested by other research groups [ 9, 17, 18].
Based on the findings of this and other studies [ 10], it may well be that the decision on the use of terminology cannot be definite and needs to be contextual.
Finally, according to the manufacturer's guidelines, the temporary PEG tube of the Freka® Pexact procedure needs to be replaced by a definite PEG tube after 4 weeks, due to the weakness of the internal balloon.
Clinical response to steroids and serial MR imaging needs to be used for establishing a definite diagnosis [1, 10, 11].
This prediction, however, obviously needs to be experimentally tested before any definite conclusions can be drawn.
Finally, it should be mentioned that the role of imaging, especially MR imaging and MRS, is rapidly changing and improving and more research needs to be done to establish its definite role.
Fixman's work in 1974 and the follow-up studies have developed a method that can factorize the inverse of mass matrix into an arithmetic combination of three sparse matrices one of them is positive definite and needs to be further factorized by using the Cholesky decomposition or similar methods.
