Abstract
<p> We investigate the relationship between the delooping level ( <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="d e l l"> <mml:semantics> <mml:mrow> <mml:mi>d</mml:mi> <mml:mi>e</mml:mi> <mml:mi>l</mml:mi> <mml:mi>l</mml:mi> </mml:mrow> <mml:annotation encoding="application/x-tex">dell</mml:annotation> </mml:semantics> </mml:math> </inline-formula> ) and the finitistic dimension of left and right serial quiver algebras. These 2-syzygy finite algebras have finite delooping level, and it can be calculated with an easy and finite algorithm. When the algebra is right serial, its right finitistic dimension is equal to its left delooping level. When the algebra is left serial, the above equality only holds under certain conditions. We provide examples to demonstrate this and include discussions on the sub-derived ( <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="normal s normal u normal b hyphen normal d normal d normal e normal l normal l"> <mml:semantics> <mml:mrow class="MJX-TeXAtom-OP MJX-fixedlimits"> <mml:mi mathvariant="normal">s</mml:mi> <mml:mi mathvariant="normal">u</mml:mi> <mml:mi mathvariant="normal">b</mml:mi> <mml:mtext>-</mml:mtext> <mml:mi mathvariant="normal">d</mml:mi> <mml:mi mathvariant="normal">d</mml:mi> <mml:mi mathvariant="normal">e</mml:mi> <mml:mi mathvariant="normal">l</mml:mi> <mml:mi mathvariant="normal">l</mml:mi> </mml:mrow> <mml:annotation encoding="application/x-tex">\operatorname {sub-ddell}</mml:annotation> </mml:semantics> </mml:math> </inline-formula> ) and derived delooping level ( <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="d d e l l right-parenthesis"> <mml:semantics> <mml:mrow> <mml:mi>d</mml:mi> <mml:mi>d</mml:mi> <mml:mi>e</mml:mi> <mml:mi>l</mml:mi> <mml:mi>l</mml:mi> <mml:mo stretchy="false">)</mml:mo> </mml:mrow> <mml:annotation encoding="application/x-tex">ddell)</mml:annotation> </mml:semantics> </mml:math> </inline-formula> . Both <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="normal s normal u normal b hyphen normal d normal d normal e normal l normal l"> <mml:semantics> <mml:mrow class="MJX-TeXAtom-OP MJX-fixedlimits"> <mml:mi mathvariant="normal">s</mml:mi> <mml:mi mathvariant="normal">u</mml:mi> <mml:mi mathvariant="normal">b</mml:mi> <mml:mtext>-</mml:mtext> <mml:mi mathvariant="normal">d</mml:mi> <mml:mi mathvariant="normal">d</mml:mi> <mml:mi mathvariant="normal">e</mml:mi> <mml:mi mathvariant="normal">l</mml:mi> <mml:mi mathvariant="normal">l</mml:mi> </mml:mrow> <mml:annotation encoding="application/x-tex">\operatorname {sub-ddell}</mml:annotation> </mml:semantics> </mml:math> </inline-formula> and <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="d d e l l"> <mml:semantics> <mml:mrow> <mml:mi>d</mml:mi> <mml:mi>d</mml:mi> <mml:mi>e</mml:mi> <mml:mi>l</mml:mi> <mml:mi>l</mml:mi> </mml:mrow> <mml:annotation encoding="application/x-tex">ddell</mml:annotation> </mml:semantics> </mml:math> </inline-formula> are improvements of the delooping level. We motivate their definitions and showcase how they can behave better than the delooping level in certain situations throughout the paper. </p>