Another name for an indirect proof is a "proof by contradiction." In this method, one assumes the opposite of what is to be proved, leading to a logical contradiction, thereby establishing the truth of the original statement. This technique is commonly used in mathematics and logic to demonstrate the validity of propositions.
It is the apex or vertex
You could call the vertex, the apex, the tip, or the point of the cone.
edge-Apex
another name for a septagon is a heptagon
Proof by contradiction is also known by its Latin equivalent, reductio ad absurdum.
An indirect proof is another name for a proof by contradiction. This is where the original premise is assumed to be false and then attempted to be proven. Because this proof turns out to be false, the original premise is then true.
apex
The Apex Predator is another name for Randy Orton, his other nickname is The Viper!
Alternative
group 16 (apex)
last name [= apex=] [L.iS.A]
crown, peak, apogee, crest, apex.
positive control (apex)
Apex.
The Jazz Age- Apex
The white man's burden