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#3: Question closed by user avatar ArtOfCode‭ · 2026-04-24T08:52:49Z (5 months ago)
#2: Post edited by user avatar zetaspace‭ · 2026-04-18T23:03:17Z (5 months ago)
  • Algebraic Geometry Resources that study this triple?
  • Algebraic geometry references that study this triple?
  • A seed
  • $$ \mathcal S = (\mathcal I, \Gamma, \Pi) $$
  • is a $\Pi$-equivariant 4-sheeted branched cover
  • $$ p: \mathcal I \to \widehat{\Bbb C} $$
  • equipped with a distinguished embedded graph
  • $$ \Gamma \subset \mathcal I $$
  • representing the intrinsic degeneration locus.
  • **Question.**
  • Hurwitz theory, the theory of D'essins, and related areas all seem to focus on particular objects within the triple of $\mathcal S$, but I am unaware of a program that collects them into one object and studies them holistically.
  • Are there resources that I've possibly missed, that do specifically study the triple $$\mathcal S = (\mathcal I, \Gamma, \Pi)$$
  • especially when the generators $\pi \in \Pi$ are defined as piecewise mappings?
  • A seed (for lack of a better name)
  • $$ \mathcal S = (\mathcal I, \Gamma, \Pi) $$
  • is a $\Pi$-equivariant 4-sheeted branched cover
  • $$ p: \mathcal I \to \widehat{\Bbb C} $$
  • equipped with a distinguished embedded graph
  • $$ \Gamma \subset \mathcal I $$
  • representing the intrinsic degeneration locus.
  • **Question.**
  • Hurwitz theory, the theory of D'essins, and related areas all seem to focus on particular objects within the triple of $\mathcal S$, but I am unaware of a program that collects them into one object and studies them holistically.
  • Are there resources that I've possibly missed, that do specifically study the triple $$\mathcal S = (\mathcal I, \Gamma, \Pi)$$
  • especially when the generators $\pi \in \Pi$ are defined as piecewise mappings?
#1: Initial revision by user avatar zetaspace‭ · 2026-04-17T19:19:13Z (5 months ago)
Algebraic Geometry Resources that study this triple?
A seed 

$$ \mathcal S = (\mathcal I, \Gamma, \Pi) $$

is a $\Pi$-equivariant 4-sheeted branched cover 

$$  p: \mathcal I \to \widehat{\Bbb C} $$ 

equipped with a distinguished embedded graph

$$ \Gamma \subset \mathcal I $$

representing the intrinsic degeneration locus.  

**Question.** 
Hurwitz theory, the theory of D'essins, and related areas all seem to focus on particular objects within the triple of $\mathcal S$, but I am unaware of a program that collects them into one object and studies them holistically.

Are there resources that I've possibly missed, that do specifically study the triple $$\mathcal S = (\mathcal I, \Gamma, \Pi)$$

especially when the generators $\pi \in \Pi$ are defined as piecewise mappings?