Title Disprove of a Conjecture on the Doubly Connected Domination Subdivision Number Type of Research Article Keywords Disprove of a Conjecture on the Doubly Connected Domination Subdivision Number Abstract Disprove of a Conjecture on the Doubly Connected Domination Subdivision Number Researchers saeed kosari (First Researcher)، Zehui Shao (Second Researcher)، Seyed Mahmoud Sheikholeslami Kavkani (Third Researcher)، hossein karami (Fourth Researcher)، Lutz Volkmann (Fifth Researcher)