C on<chr_abbr type="reg" class="dc" expan="que" cert="no">q-hbar</chr_abbr><chr_var letter="s" var="long">∫</chr_var> plu<chr_var letter="s" var="long">∫</chr_var> apr<chr_abbr type="reg" class="dc" expan="en" cert="no">e-hbar</chr_abbr>dre n<chr_abbr type="reg" class="dc" expan="en" cert="no">e-hbar</chr_abbr> pot. 