-p'>)</span><span class='hljl-t'> </span><span class='hljl-oB'>=</span><span class='hljl-t'> </span><span class='hljl-n'>u</span><span class='hljl-t'>
    </span><span class='hljl-p'>(</span><span class='hljl-n'>β</span><span class='hljl-p'>,</span><span class='hljl-n'>c</span><span class='hljl-p'>,</span><span class='hljl-n'>γ</span><span class='hljl-p'>,</span><span class='hljl-n'>δt</span><span class='hljl-p'>)</span><span class='hljl-t'> </span><span class='hljl-oB'>=</span><span class='hljl-t'> </sp