2018-10-15 13:26:04 +00:00
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<math display="block"><mrow><mo stretchy="false">{</mo><munder><mrow><mover><mrow><mpadded width="0em"><mphantom><mo>(</mo></mphantom></mpadded><mi>a</mi><mo>,</mo><mo>...</mo><mo>,</mo><mi>a</mi></mrow><mover><mo>&OverBrace;</mo><mrow><mi>k</mi><mtext>&nbsp;</mtext><mi>a</mi><mtext>\'s</mtext></mrow></mover></mover><mo>,</mo><mover><mrow><mpadded width="0em"><mphantom><mo>(</mo></mphantom></mpadded><mi>b</mi><mo>,</mo><mo>...</mo><mo>,</mo><mi>b</mi></mrow><mover><mo>&OverBrace;</mo><mrow><mi>&ell;</mi><mtext>&nbsp;</mtext><mi>b</mi><mtext>\'s</mtext></mrow></mover></mover></mrow><munder><mo>&UnderBrace;</mo><mrow><mi>k</mi><mo>+</mo><mi>&ell;</mi><mtext>&nbsp;elements</mtext></mrow></munder></munder><mo stretchy="false">}</mo></mrow></math>
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