# On band orthorings

## TL;DR

This paper investigates the structure of band orthorings, showing they can be decomposed into spined products of band semirings and establishing a lattice isomorphism between varieties of rings and band orthorings.

## Contribution

It introduces a decomposition theorem for band orthorings and characterizes their variety lattice in relation to band semirings.

## Key findings

- Band orthorings can be decomposed into spined products of band semirings.
- The variety lattice of band orthorings is isomorphic to that of band semirings.
- A new structural insight into the relationship between rings, orthorings, and band semirings.

## Abstract

A semiring $S$ which is a union of rings is called completely regular, if moreover, it is orthodox then $S$ is called an orthoring. Here we study the orthorings $S$ such that $E^+(S)$ is a band semiring. Every band semiring is a spined product of a left band semiring and a right band semiring with respect to a distributive lattice. A similar spined product decomposition for the band orthorings have been proved. The interval $[\mathbf{Ri}, \mathbf{BOR}]$ is lattice isomorphic to the lattice $\mathcal{L}(\mathbf{BI})$ of all varieties of band semirings, where $\mathbf{Ri}$ and $\mathbf{BOR}$ are the varieties of all rings and band orthorings, respectively.