ON p. 409 your reviewer states that “Euclid says nothing about the extreme points of the line” in his definition of a straight line, but regards “all the points on it.” ...

Margaret Wertheim gave a talk for the Australian Mathematical Sciences Institute at their 2016 annual Summer School. We have built a world of largely straight lines – the houses we live in, the ...

This command is used to define new lines or to redefine existing lines. If an existing line is redefined then the position of any existing parts whose definition depends on the line will change ...