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Oct 9, 2014 at 9:09 comment added Vladimir S Matveev May be missunderstanding is due to different definitions? Because for me a sufrace isometric to the round sphere is necessary complete since completeness is for me a metric property and the round sphere is complete in the metric sense which implies that anything isometric to the round sphere is also complete which contradicts what you wrote in your comment. What is your definition of completeness?
Oct 8, 2014 at 15:42 comment added Narasimham Either for K=1 or K=-1 in $ k_1 k_2 = K = constant $ $ k_1 $ goes to infinity when $ k_2 $ goes to zero producing cuspidal boundaries which demarcate periodic segments of an otherwise regular surface. Apart from above example Sievert surface also has a cuspidal edge...they are not complete regular even though isometric to round ball.
Oct 8, 2014 at 13:05 history answered Vladimir S Matveev CC BY-SA 3.0