My friends gave me a problem that he said it can be very simple to be proved, but really it is not (to me)(adsbygoogle = window.adsbygoogle || []).push({});

There is an ink stain with area of smaller than 1cm2 on a sheet of paper. Prove that there is always possibility you can place a net with square mesh of 1 x 1 cm on the sheet so that not any knot point touches the ink stain.

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# The net and an ink stain

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