Two papers : [electronic resource] H-coextensions of monoids ; and, The structure of a band of groups / Jonathan Leech.

"Volume 1, Number 157 (second of 3 numbers), March 1975."

Includes bibliographical references (p. 95).

$\mathcal {H}$-coextensions of monoids Introduction 1. The categories, $\mathbb {D}(S)$ and $\mathcal {D}(S)$ 2. Congruences under $\mathcal {H}$ 3. $\mathcal {H}$-coextensions of monoids 4. Split $\mathcal {H}$-coextensions of a monoid 5. Abelian coextensions and cohomology The structure of a band of groups Introduction 1. The general case 2. Some remarks on the category of bands 3. Central bands of groups 4. Cohomological considerations 5. The case where $\mathbb {B}$ is functorial over $\tilde {\mathbb {B}}$ 6. The case when $\mathbb {B}$ is an $A$-band 7. Remarks on the splitting case

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Electronic reproduction. Providence, Rhode Island : American Mathematical Society. 2012

Mode of access : World Wide Web

Description based on print version record.