 It surprisingly turns out that one of such equivalent conditions applies the semidefinite programming (SDP) , which leads to a practical usefulness.
<coherence>  It surprisingly turns out that one of such equivalent conditions applies the semidefinite programming (SDP) , which leads to a practical usefulness.
 Interestingly, one of such equivalent conditions applies the semidefinite programming (SDP) , which leads to a practical usefulness.