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There R represents the field of real numbers with given precision. It is just used for conversion.
You can try it with the following example
sage: R=RealField()
sage: 1
1
sage: type(1)
sage.rings.integer.Integer
sage: R(1)
1.00000000000000
sage: type(R(1))
sage.rings.real_mpfr.RealNumber
