Математичний аналіз і диференціальні рівняння вивчаю САМ

I am sorry for off-topic, I'm thinking about building an interesting site for students. Will probably commence with submitting interesting facts like"Representations of butterflies are seen in Egyptian frescoes at Thebes, which are 3,500 years old."Please let me know if you know where I can find some related information such as right here

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