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Published on
January 19, 2015
Proof of the Pythagorean Theorem Attributed to Pythagoras
geometry mathematics
A classic rearrangement proof attributed to Pythagoras.
Published on
January 18, 2015
The Equality of Vertically Opposite Angles
geometry mathematics
Proof and historical attribution of vertically opposite angles.
Published on
January 13, 2015
What Is Countable Infinity?
set-theory mathematics
Countable infinity refers to infinite sets whose elements can be listed in a sequence.
Published on
January 12, 2015
Hilbert's Hotel, A Thought Experiment on Infinity
set-theory mathematics
A classic thought experiment that explores infinity.
Published on
January 11, 2015
The Empty Set Has Only One Subset
set-theory mathematics
The empty set is its own only subset, as it contains no elements to include in any other set.