F oi <chr_abbr type="reg" class="dc" expan="que" cert="no">q-hbar</chr_abbr> doi <chr_var letter="s" var="long">∫</chr_var>a<chr_abbr type="reg" class="dc" expan="int" cert="no">it-hbar</chr_abbr> pere la po<chr_var letter="s" var="long">∫</chr_var>tre 