theorem Th36: :: WAYBEL12:36

for L being lower-bounded continuous LATTICE
for x being Element of L
for N being non empty countable Subset of L st ( for n, y being Element of L st not y <= x & n in N holds
not y "/\" n <= x ) holds
for y being Element of L st not y <= x holds
ex p being irreducible Element of L st
( x <= p & not p in uparrow ({y} "/\" N) )