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"the sum of angles of any triangle is not more than Pi" I want to know the proof of this statement without using the fifth axiom of Euclid.Thank you

If higher derivatives based on combinations of first derivatives then no need to put first derivative in the formula because it is based on coordinates .I can not imagine that you believe it as soon...

If higher derivatives based on combinations of first derivatives then no need to put first derivative in the formula because it is based on coordinates .I can not imagine that you believe it as soon...

Every mechanichal system is characterised by a definite function depending on the coordinates of each point of the system, the first time derivative of these coordinates, and time.
What is the proof...

Can I see the 4 moons of jupiter by a 30 mm telescope in thecity light?

My son is 6 years old. He loves astronomy so much. What is the most suitable telescopes for him? Is it 30mm, 50mm, orbigger one?