S oit b<chr_abbr type="reg" class="dc" expan="" cert="no">n-hbar</chr_abbr> vignan<chr_var letter="s" var="long">∫</chr_var> do<chr_abbr type="" class="" expan="" cert="no">[apost]</chr_abbr>c<chr_abbr type="reg" class="dc" expan="que" cert="no">q-hbar</chr_abbr>le viegne 