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elliptic curve arithmetic without inversion

It seems when you add points on an elliptic curve in sage, it immediately divides by the z coordinate if it is not zero. Since I plan on working in a finite field of a large prime, I would rather it not calculate this inverse, but I'm not sure how to stop it from automatically doing so. How do I get it to leave the z coordinate alone so as to avoid inverting elements of my field?

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elliptic curve arithmetic without inversion

It seems when you add points on an elliptic curve in sage, it immediately divides by the z coordinate if it is not zero. Since I plan on working in a finite field of a large prime, I would rather it not calculate this inverse, but I'm not sure how to stop it from automatically doing so. How do I get it to leave the z coordinate alone so as to avoid inverting elements of my field?