What is the exact solution of : $$h'(t)=h(t-\tau)?$$
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1Too many to list. A sine, properly scaled, is one of them. – user58697 May 29 '19 at 22:54
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for exact solution!!Can you introduce the source? – farzaneh alizadeh May 29 '19 at 23:19
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Welcome to Mathematics Stack Exchange! A quick tour will enhance your experience. Here are helpful tips to write a good question and write a good answer. For equations, please use MathJax. – dantopa May 29 '19 at 23:47
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Use Laplace transform or consider directly the notion of characteristic equation that you will find in https://en.wikipedia.org/wiki/Delay_differential_equation. Besides,are you sure you don't need an initial condition ? – Jean Marie May 30 '19 at 01:17
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Thank you for your kind attention, I do not have any initial condition. When I use Laplace, I can not get the final answer, since it's hard for me. – farzaneh alizadeh Jun 02 '19 at 11:07