Description: From a point C outside of a line A , there exists a point x on A such that ( C L x ) is perpendicular to A . This point is unique, see foot . (Contributed by Thierry Arnoux, 19-Oct-2019) (Revised by Thierry Arnoux, 1-Jul-2023)
Ref | Expression | ||
---|---|---|---|
Hypotheses | isperp.p | |
|
isperp.d | |
||
isperp.i | |
||
isperp.l | |
||
isperp.g | |
||
isperp.a | |
||
foot.x | |
||
foot.y | |
||
Assertion | footex | |