theorem Th25: :: GOBRD11:25

for G being empty-yielding X_equal-in-line Y_equal-in-column Matrix of (TOP-REAL 2) holds cell (G,0,(width G)) = { |[r,s]| where r, s is Real : ( r <= (G * (1,1)) `1 & (G * (1,(width G))) `2 <= s ) }