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 Oct 10 comment Function that returns negative number for negative x and y @CarlWitthoft Clear, but how do You write reciprocals without division? Oct 10 accepted Function that returns negative number for negative x and y Oct 10 comment Function that returns negative number for negative x and y @mvw finite many operations Oct 10 comment Function that returns negative number for negative x and y if and only if both x and y are negative. Oct 10 comment Function that returns negative number for negative x and y @Alan I don't really know why is this restriction. I was just asked for help to figure out this small part of a bigger problem. Oct 10 awarded Student Oct 10 asked Function that returns negative number for negative x and y Apr 9 awarded Scholar Apr 9 accepted Explanation and validation of point adding/doubling on elliptic curves Apr 5 awarded Supporter Apr 5 comment Explanation and validation of point adding/doubling on elliptic curves Thanks for the answer! I don't think it is a typo. One says lambda(x_3-x_1)+y_1, other says lambda(x_1-x_3)-y_1 , which is -1 times the first one. No typo or double typo. Apr 5 asked Explanation and validation of point adding/doubling on elliptic curves