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 On the $2$-bridge knots of Dunwoody $(1,1)$-knots Bull. Korean Math. Soc. 2011 Vol. 48, No. 1, 197-211 https://doi.org/10.4134/BKMS.2011.48.1.197Published online January 1, 2011 Soo Hwan Kim and Yangkok Kim Dong-eui University, Dong-eui University Abstract : Every $(1,1)$-knot is represented by a $4$-tuple of integers $(a,b$, $c,r),$ where $a>0,$ $b\geq 0,$ $c\geq 0,$ $d=2a+b+c,r\in \mathbb{Z}_{d},$ and it is well known that all $2$-bridge knots and torus knots are $(1,1)$-knots. In this paper, we describe some conditions for 4-tuples which determine $2$ -bridge knots and determine all $4$-tuples representing any given $2$-bridge knot. Keywords : (1,1)-knot, (1,1)-decomposition, cyclic branched covering, crystallization, Dunwoody manifold, Heegaard splitting, Heegaard diagram, 2-bridge knot, torus knot MSC numbers : Primary 57M25; Secondary 57M27 Full-Text :