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Elliptic Curve Rational Field Height CODE

Hi, I would like to know what does the function R() in lines 5060,5061 etc do. This is the code that I'm looking at:

http://hg.sagemath.org/sage-main/file/d06cf4b2215d/sage/schemes/elliptic_curves/ell_rational_field.py#l1

Thank you!

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