<para>Each chapter should be preceded by an abstract (10–15 lines long) that summarizes the content. The abstract will appear <emphasis>online at <linkxlink:href="www.SpringerLink.com">www.SpringerLink.com</link> and be available with unrestricted access. This allows unregistered users to read the abstract as a teaser for the complete chapter. As a general rule the abstracts will not appear in the printed version of your book unless it is the style of your particular book or that of the series to which your book belongs.</emphasis><!-- \indent -->
Please use the 'starred' version of the <code>abstract</code> environment for typesetting the text of the online abstracts. Use the plain <code>abstract</code> if the abstract is also to appear in the printed version of the book.</para>
<para>Each chapter should be preceded by an abstract (10–15 lines long) that summarizes the content. The abstract will appear <emphasis>online at <linkxlink:href="www.SpringerLink.com">www.SpringerLink.com</link> and be available with unrestricted access. This allows unregistered users to read the abstract as a teaser for the complete chapter. As a general rule the abstracts will not appear in the printed version of your book unless it is the style of your particular book or that of the series to which your book belongs.</emphasis><!-- \indent -->
Please use the 'starred' version of the <code>abstract</code> environment for typesetting the text of the online abstracts. Use the plain <code>abstract</code> if the abstract is also to appear in the printed version of the book.</para>
however, for multiline equations we recommend to use the <emphasisrole='sans'>eqnarray</emphasis> environment<footnote>
<para>In physics texts please activate the class option <code>vecphys</code> to depict your vectors in <emphasisrole='bold'><emphasis>boldface-italic</emphasis> type - as is customary for a wide range of physical subjects.</emphasis></para>