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Explain xkcd: It's 'cause you're dumb.
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Proof Without Content
There's also a proof without content of a conjecture without content, but it's left as an exercise for the reader.
Title text: There's also a proof without content of a conjecture without content, but it's left as an exercise for the reader.

Explanation

This comic refers to a proofs without words, which rely on images or other geometric tools to visually demonstrate a concept without further explanation. The comic gives an example of a proof without any content at all, which proves its own existence.

This proof requires the conjecture to be stated, which could be construed as content.

The title text refers to another proof without content, that a conjecture without content could exist. This would imply a conjecture-proof pair with no content whatsoever. This could only be discussed indirectly, which is why it is mentioned and left as an exercise for the reader. Alternatively, the exercise could be forming the conjecture and proof itself if the comic is interpreted as a blank sheet of paper.

Transcript

[Within a panel, two boxes stacked vertically. Each one has a label above it.]
Conjecture:
[Within the box]
It's possible to construct a convincing proof without words, pictures, or content of any kind.
[The next label]
Proof:
[The box underneath this label is empty.]
[Caption under the panel]
Proofs without words are cool, but we can go further.

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