TY - UNPB

T1 - A survey of congruences and quotients of partially ordered sets

AU - Williams, Nicholas J.

N1 - 45 pages (39 pages excluding references), 8 figures, 1 table. Comments very welcome. v2: added references and new example to example section

PY - 2023/3/7

Y1 - 2023/3/7

N2 - The literature on congruences and quotients of partially ordered sets contains a large and profilerating array of approaches, but little in the way of systematic exposition and examination of the subject. We seek to rectify this by surveying the different approaches in the literature and providing philosophical discussion on requirements for notions of congruences of posets. We advocate a pluralist approach which recognises that different types of congruence arise naturally in different mathematical situations. There are some notions of congruence which are very general, whilst others capture specific structure which often appears in examples. Indeed, we finish by giving several examples where quotients of posets appear naturally in mathematics.

AB - The literature on congruences and quotients of partially ordered sets contains a large and profilerating array of approaches, but little in the way of systematic exposition and examination of the subject. We seek to rectify this by surveying the different approaches in the literature and providing philosophical discussion on requirements for notions of congruences of posets. We advocate a pluralist approach which recognises that different types of congruence arise naturally in different mathematical situations. There are some notions of congruence which are very general, whilst others capture specific structure which often appears in examples. Indeed, we finish by giving several examples where quotients of posets appear naturally in mathematics.

KW - math.CO

KW - math.HO

KW - 06-02, 06A06, 06A07, 06B10

M3 - Preprint

BT - A survey of congruences and quotients of partially ordered sets

ER -