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Find the best solution to connect the nine points together with no more than four straight lines without lifting your writing instrument.
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What assumptions are you making?
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“Everything “ that can be invented “ has been invented.” Charles H. Duell Commissioner of U.S. Office of Patents, urging President William McKinley to abolish his office, 1899
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Don’t assume that the line must be thin .
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Just to prove I can do it with two lines.
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Don’t assume that the paper must be flat .
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If you rip the paper into nine segments, you can stack them and poke your point through all at once .
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Don’t assume that you cannot crease the paper.
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Don’t assume that the lines cannot extend beyond the edge of the paper.
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Don’t assume that you cannot rip the paper.