On connected sums and Legendrian knots
Joint work with Ko Honda.
Adv. Math. 179 (2003), 59-74.

We study the behavior of Legendrian and transverse konts under the operation of connected sums. As a consequence we show that there exist Legendrian knots that are not distinguished by any known invariant. Moreover, we classify Legendrian knots in some non-Legendrian simple knot types.

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