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Kritični simpleksi v vztrajni homologiji : doktorska disertacija
ID Goričan, Peter (Author), ID Virk, Žiga (Mentor) More about this mentor... This link opens in a new window, ID Repovš, Dušan (Comentor)

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Abstract
V doktorskem delu obravnavamo vztrajno homologijo, dobljeno z uporabo homologije na odprti Ripsovi filtraciji kompaktnega metričnega prostora $(X,d)$. Pokažemo, da je vsako zmanjšanje $0$-dimenzionalne vztrajne homologije ter vsako povečanje $1$-dimenzionalne vztrajne homologije posledica lokalnih minimumov razdaljne funkcije $d$. Kadar $d$ doseže lokalni minimum le za končno mnogo parov točk, dokažemo, da vsako tako spremembo v vztrajni homologiji povzroči določena kritična povezava v Ripsovih kompleksih, ki predstavlja lokalni minimum funkcije $d$. Rezultati vključujejo zgornje meje za rang $1$-dimenzionalne vztrajne homologije in pripadajoči rekonstrukcijski izrek. Z računalniškega vidika je zanimivo, da obstaja preprost geometrijski kriterij za prepoznavanje tistih lokalnih minimumov funkcije $d$, ki povzročijo spremembe v vztrajni homologiji. Ti rezultati predstavljajo prvo interpretacijo kritičnih vrednosti vztrajne homologije (pridobljene z Ripsovimi kompleksi) za splošne kompaktne metrične prostore.

Language:Slovenian
Keywords:metrični prostor, vztrajna homologija, simplicialni kompleks, Ripsov kompleks, lokalni minimum, kritična vrednost
Work type:Doctoral dissertation
Typology:2.08 - Doctoral Dissertation
Organization:FMF - Faculty of Mathematics and Physics
Year:2025
PID:20.500.12556/RUL-174114 This link opens in a new window
UDC:515.1
COBISS.SI-ID:251086595 This link opens in a new window
Publication date in RUL:27.09.2025
Views:450
Downloads:150
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Secondary language

Language:English
Title:Critical simplices in persistent homology
Abstract:
In this dissertation, we study the persistent homology obtained by the homology on the open Rips filtration of a compact metric space $(X,d)$. We show that every decrease in $0$-dimensional persistent homology and every increase in $1$-dimensional persistent homology is a consequence of local minima of the distance function $d$. When $d$ attains a local minimum for only finitely many pairs of points, we prove that each such change in the persistent homology is caused by a specific critical edge in the Rips complexes corresponding to a local minimum of the function $d$. The results include upper bounds for the rank of the $1$-dimensional persistent homology and a corresponding reconstruction theorem. From a computational point of view, it is noteworthy that there is a simple geometric criterion to identify those local minima of the distance function d that cause changes in the persistent homology. These results provide the first interpretation of the critical values of the persistent homology (obtained by Rips complexes) for general compact metric spaces.

Keywords:metric space, persistent homology, simplicial complex, Rips complex, local minimum, critical value

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