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+Continued Fractions - Core Algorithms
+=====================================
+
+TLA specs for:
+
+1. Core algorithm for finding the (unique) simple continued fraction of a rational number based on Euclidean division.
+2. Algorithm for constructing a rational number from the sequence of coefficients of a simple continued fraction.
+3. Algorithm for finding the k-th convergent of a simple continued fraction.
+4. Algorithm for finding the k-th remainder of a simple continued fraction.
+5. Algorithm for finding the semiconvergent of two consecutive convergents of a simple continued fraction.