supported by Taishan University Starting Grant “Studies on Algebraic Sahlqvist Theory”;the Taishan Young Scholars Program of the Government of Shandong Province,China (tsqn201909151);the Support Plan on Science and Technology for Youth Innovation of Uni-versities in Shandong Province (2021KJ086)。
supported by the Humanities and Social Sciences Planning Foundation of Chinese Ministry of Education(Grant No.13YJA72040001);by the National Natural Science Foundation of China under Grant No.61273338/F030603