Where Schwarzschild equation is a generalization of Pythagorus's
equation in rt. triangle and yet still forms the basis for black holes >mathematics and physics.
Go to:
https://www.relativitycalculator.com/X-Cart/special_offers.html
But in particular, go to:
https://www.relativitycalculator.com/X-Cart/combo-schwarzschild-black-ho >les.html?category_id=221
Check it out. Wont hurt you.
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