Kép:Hilbert curve.png
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Hilbert_curve.png (544 × 352 képpont, fájlméret: 6 KB, MIME-típus: image/png)
Diagram shown the first six steps of David Hilbert's space-filling curve. Drawn by Zbigniew Fiedorowicz. Taken from http://www.math.ohio-state.edu/~fiedorow/math655/Peano.html
What follows is an email to him and his reply.
Dear Dr Fiedorowicz Re: http://www.math.ohio-state.edu/~fiedorow/math655/Peano.gif I am writing to you on behalf of the Wikipedia project http://www.wikipedia.org, an endeavour to build a fully-fledged multilingual encyclopaedia in an entirely open manner, to ask for permission to use your copyrighted material. Your website has a page on the Peano curve that has a wonderful illustration showing the first six iterations which would undoubtedly enhance our page http://en.wikipedia.org/wiki/Space-filling_curve I should like to ask for your permission to use it under the terms of Wikipedia's licence. Wikipedia licenses all its content under the licence developed for purposes of free documentation by the Free Software Foundation, the text of which can be found at http://www.gnu.org/copyleft/fdl.html It should be borne in mind that if you choose to allow Wikipedia to use the diagram, it will remain copyrighted to you; however, the said licence stipulates that third parties must be permitted to reuse the licensed work so long that they retain the licence of this work and any derivatives from it. Consequently, you may wish to consider carefully whether you are prepared to compromise some of your rights granted to you by copyright law by licensing your work as suggested. If you do choose to give permission we shall greatly appreciate it. Thank you for your time and consideration.
I look forward to your reply. Yours faithfully Theresa Knott
His reply was
Please feel free to use it.
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