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<h3>Short Notes</h3>
<ul>

<li><strong>Combing a hedgehog over
&rationals;<sub>2</sub></strong><br>
[<a href="Notes/qf_minus7.pdf">note (2024)]</a><br>(see Remark 1.10 of
Alexey Ananyevskiy, Marc
Levine: <a href="https://doi.org/10.2140/ant.2025.19.2409">Combing a
hedgehog over a field</a>)</li>

<li><strong>A note about incidence matrices of projective
planes</strong><br>
[<a href="Notes/incidence_matrix_birkhoff.pdf">note (2024)]</a></li>

<li><strong>Alternativer Beweis des Satzes von Cavachi</strong><br>
  [<a href="Notes/cavachi_alternative.pdf">note (2022)]</a><br> (see
  Marius Cavachi: <a href="https://doi.org/10.1006/jnth.1999.2476">On
  a special case of Hilbert's irreducibility theorem</a>)</li>

<li><strong>Common eigenvector of commuting pair of
endomorphisms</strong><br>
[<a href="Notes/commuting_endomorphisms.pdf">note (2021)]</a></li>

<li><strong>A remark on the sum of squares law</strong><br>
[<a href="Notes/remark_on_sum_of_squares_law.pdf">note
(2017)]</a></li>

<li><strong>Turnwald’s proof of Wan’s value set bound</strong><br>
[<a href="Notes/wan-bound.pdf">note (2017)]</a></li>

<li><strong>Irreducibility of X<sup>n</sup> − X − 1</strong><br>
[<a href="Notes/selmer_trinomial.pdf">note (2015)]</a></li>

<li><strong>A note on primitive groups containing a
3–cycle</strong><br> [<a href="Notes/three-cycles.pdf">note
(2013)]</a></li>

<li><strong>Simple lower bound of Euler's totient
function</strong><br> [<a href="Notes/eulerphi.pdf">note
(2011)]</a></li>

<li><strong>A note on Morse polynomials</strong><br>
[<a href="Notes/morse.pdf">note (2011)]</a></li>

<li><strong>Simple algebras, Skolem–Noether, ...</strong><br>
[<a href="Notes/simple_algebras.pdf">note (2010)]</a></li>

<li><strong>On products of transpositions</strong><br>
[<a href="Notes/product_of_transpositions.pdf">note (2005)]</a></li>

<li><strong>The degree 8 examples in Davenport's problem</strong><br>
[<a href="Notes/dav8.pdf">note (2006)</a>]</li>

<li><strong>Value sets of polynomials on Hilbertian
fields</strong><br> [<a href="Notes/hilb.pdf">note (2005)]</a></li>

<li><strong>Nicht-Torsion in abelschen Varietäten</strong><br>
[<a href="Notes/abelvar.pdf">note (2004)]</a></li>

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