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How can I use rationalized haar functions to solve differential equations?

I do not have any idea what are haar functions and how to use them please help!

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They form an orthonormal basis in $L_2[0,1]$. See here. –  Mhenni Benghorbal Sep 2 '12 at 11:27
Here is a paper. –  Mhenni Benghorbal Sep 2 '12 at 14:31
@MhenniBenghorbal thank you very much it really helps me –  Mohammad Rafiee Sep 15 '12 at 5:22
You are welcome. I am really happy that you benefited from the paper. Good luck. –  Mhenni Benghorbal Sep 16 '12 at 6:40

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