Imagine you have four cubes, whose faces are colored red, blue, yellow, and green. Can you stack these cubes so that each color appears exactly once on each of the four sides of the stack?
Can you save the target from his assassin in a square room with bouncy walls?
Set theory is the foundation of all of mathematics. How does it handle infinity?
When you think about math, what do you think of knots? Probably... knot.
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