Shape

22 Introduction: Tell Me All About It
if there’s a triangle, then rotate it
where a triangle is some combination of constituents. This is a symbolic version of the
rule
that’s defined for shapes. I’ve already shown how I wanted this kind of rule to work, so
that it applies in terms of embedding, and erasing and drawing lines. But right now it
makes sense to distinguish the triangle in the shape
to calculate in the right way with symbols. Three lines
were all I needed to draw the shape, except that a constituent for each line won’t do
for what I want. There’s no triangle. So why not describe the shape as a triangle and
three little angles that look like the angle brackets h and i
That’s good, but a triangle is normally defined to have three sides. So three lines and
three angles might be better yet
And I may as well divide the angles up to make everything lines