M(25,1,1)

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M(25,1,1) - [math]kC_{25}[/math]
M(2,1,1)quiver.png
Representative: [math]kC_{25}[/math]
Defect groups: [math]C_{25}[/math]
Inertial quotients: [math]1[/math]
[math]k(B)=[/math] 25
[math]l(B)=[/math] 1
[math]{\rm mf}_k(B)=[/math] 1
[math]{\rm Pic}_k(B)=[/math] [math]k^{23}:k^*[/math]
Cartan matrix: [math]\left( \begin{array}{c} 25 \\ \end{array} \right)[/math]
Defect group Morita invariant? Yes
Inertial quotient Morita invariant? Yes
[math]\mathcal{O}[/math]-Morita classes known? Yes
[math]\mathcal{O}[/math]-Morita classes: [math]\mathcal{O} C_{25}[/math]
Decomposition matrices: [math]\left( \begin{array}{c} 1 \\ 1 \\ \vdots \\ 1 \\ \end{array}\right)[/math]
[math]{\rm mf}_\mathcal{O}(B)=[/math] 1
[math]{\rm Pic}_{\mathcal{O}}(B)=[/math] [math]\mathcal{L}(B)=C_{25}:C_{20}[/math]
[math]PI(B)=[/math] {{{PIgroup}}}
Source algebras known? Yes
Source algebra reps: [math]kC_{25}[/math]
[math]k[/math]-derived equiv. classes known? Yes
[math]k[/math]-derived equivalent to: Forms a derived equivalence class
[math]\mathcal{O}[/math]-derived equiv. classes known? Yes
[math]p'[/math]-index covering blocks: M(25,1,2), M(25,1,4)
[math]p'[/math]-index covered blocks:
Index [math]p[/math] covering blocks: {{{pcoveringblocks}}}


These are nilpotent blocks.

Basic algebra

Quiver: a:<1,1>

Relations w.r.t. [math]k[/math]: [math]a^{25}=0[/math]

Other notatable representatives

Covering blocks and covered blocks

Let [math]N \triangleleft G[/math] with [math]p'[/math]-index and let [math]B[/math] be a block of [math]\mathcal{O} G[/math] covering a block [math]b[/math] of [math]\mathcal{O} N[/math].

If [math]b[/math] lies in M(25,1,1), then [math]B[/math] must lie in M(25,1,1), M(25,1,2) or M(25,1,4). For example consider the principal blocks of [math]C_{25} \triangleleft D_{50}, C_{25}:C_4[/math].

If [math]B[/math] lies in M(25,1,1), then [math]b[/math] must lie in M(25,1,1), M(25,1,2) or M(25,1,4). Example needed.

Projective indecomposable modules

Labelling the unique simple [math]B[/math]-module by [math]S_1[/math], the unique projective indecomposable module has Loewy structure as follows:

[math]\begin{array}{c} S_1 \\ S_1 \\ \vdots \\ S_1 \\ \end{array} [/math]

Irreducible characters

All irreducible characters have height zero.

Back to [math]C_{25}[/math]