However this is no longer true in math mode, see section B.7.5 on spaces in math mode. Paragraphs New paragraphs are introduced by one blank line or more. Paragraphs are not indented. Footnotes appear at document end in the article style and at every chapter end in the book style. Footnotes are bad.
Users can then choose their own equivalent for the symbol.
However, it is more simple to write the document using iso-latin1.