What Is The Meaning Of Mantle In This Sentence

In mathematical notation, what are the usage differences between the various approximately-equal signs "≈", "≃", and "≅"? The Unicode standard lists all of them inside the Mathematical …. Additionally, Whats the meaning of this symbol? Its a three dot symbol: ∴ I read a book, im could not find any definition of this symbol. Furthermore, Google search-bar gives the definition of Hermitian as: Hermitian: denoting or relating to a matrix in which those pairs of elements that are symmetrically placed with respect to the principal di. Moreover, After looking at the Wikipedia article on topological space, I still cannot grasp intuitively what topological space is. These findings regarding What Is The Meaning Of Mantle In This Sentence provide comprehensive context for understanding this subject.