
premises
# TH_2
% if two distinct lines have a common point, then it is unique

line(1)
line(2)
point(3)
point(4)
~eq_line(1,2)
inc_po_l(3,1)
inc_po_l(3,2)
inc_po_l(4,1)
inc_po_l(4,2)

conclusions

eq_point(3,4)
