for p being Point of (TOP-REAL 2) st p `2 > 0 holds
for x being Real
for a being non negative Real
for y, r being positive Real st (+ (x,y,r)) . p > a holds
( |.(|[x,y]| - p).| > r * a & (Ball (p,(|.(|[x,y]| - p).| - (r * a)))) /\ y>=0-plane c= (+ (x,y,r)) " ].a,1.] )