id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ap-1420	Znojil, M.	The Horizons of Observability in PT-symmetric Four-site Quantum Lattices	2011	10	.pdf	application/pdf	5877	314	69	= { (a, b, c) ∈ R3 |W (a, b, c) > 0 , (3) Q(a, b, c) > 0 , P (a, b, c) > 0 } where W (a, b, c) = ( 8 + c2 − a2 )2 − (4) 4 [ 16 − (a + c)2 ] b2 , Q(a, b, c) = [ (a + 3)(c − 1) − b2 ] · (5)[ (a − 3)(c + 1) − b2 ] and P (a, b, c) = 10 − a2 − 2 b2 − c2 . As long as the –3 –2 –1 0 1 2 3 c –3 –2 –1 0 1 2 3 a Fig. 4: The degenerate case of the simply connected rec- tangular domain D(H) at b = 0 –2 –1 0 1 2 b –3 –2 –1 0 1 2 3 a Fig. 5: The triply connected nature of the triple-overlap domain D(H) for the quantum lattice of Figure 2 at c = 0 (i.e., in the no-central-coupling extreme) 106 Acta Polytechnica Vol. 51 No. 4/2011 condition Q(a, b, 0) > 0 degenerates to the elemen- tary constraint 3 + b2 > a > −3 − b2 just the left and right small horizontal-parabolic seg- ments (with their extreme at b = 0 and |amax| = 3) should be cut out of the elliptic domain with P (a, b, 0) > 0 as inadmissible since Q(a, b, 0) < 0 there.	cache/ap-1420.pdf	txt/ap-1420.txt