Nope, it's literally "twice colon" where colon is specifically the punctuation mark. פעמים נקודותיים
The average of the 3 points would give you the triangle's centroid, not necessarily its circumcenter. You can still calculate the circumradius from a, b, and c: https://mathworld.wolfram.com/Circumradius.html. You could…
The point of the article is to point out the non-obviousness of some true statement that an outsider to mathematics would take to be obviously true, and thus to demonstrate the necessity of formal (or at least careful)…
Nope, it's literally "twice colon" where colon is specifically the punctuation mark. פעמים נקודותיים
The average of the 3 points would give you the triangle's centroid, not necessarily its circumcenter. You can still calculate the circumradius from a, b, and c: https://mathworld.wolfram.com/Circumradius.html. You could…
The point of the article is to point out the non-obviousness of some true statement that an outsider to mathematics would take to be obviously true, and thus to demonstrate the necessity of formal (or at least careful)…