Geodesic
On a conjecture of Král concerning the subharmonic extension of continuously differentiable functions
Mathematica Bohemica, Tome 145 (2020) no. 1, pp. 71-73.

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This note verifies a conjecture of Král, that a continuously differentiable function, which is subharmonic outside its critical set, is subharmonic everywhere.
DOI : 10.21136/MB.2019.0104-18
Classification : 31B05
Keywords: subharmonic function; extension theorem 
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Gardiner, Stephen J.; Sjödin, Tomas. On a conjecture of Král concerning the subharmonic extension of continuously differentiable functions. Mathematica Bohemica, Tome 145 (2020) no. 1, pp. 71-73. doi : 10.21136/MB.2019.0104-18. http://geodesic.mathdoc.fr/articles/10.21136/MB.2019.0104-18/

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