# Fleischer in Leipzig publishes Disquisitiones Arithmeticae

Date: 1801

## The fact

In 1801 Gerhard Fleischer in Leipzig issued [Gauss](/people/carl-friedrich-gauss)’s Disquisitiones Arithmeticae, a Latin octavo of seven sections that reorganised elementary number theory around congruences, quadratic forms, and cyclotomic equations. An intended eighth section remained among papers and is not this book. Gauss wrote the text, largely by 1798; the 1801 colophon is the public act. Printers and a princely subsidy manufactured the object. The row does not split seven sections into twins. Later 1863 and 1870 collected-works reprints are other instruments.

## Context

Before 1801, number theory in print was a scatter of memoirs by Fermat’s heirs, Euler, Lagrange, and Legendre. Disquisitiones made a book-shaped school: definitions, proofs, and a language of congruences others could teach from. That is education, not a claim that 1801 invented every later ideal or Gaussian integer — those names and theories are later. Do not treat SI units, error curves, or electronics as this octavo. Do not treat the unpublished diary as if it were the 1801 shop copy.

Later competitions, monuments, translations, UNESCO listings, museums, and adaptations are not converted into extra lifetime acts.

## Evidence and sources

A digitised 1801 Latin copy is public at Internet Archive. MacTutor independently reprints Gauss’s own preface material and dates the 1801 issue, including Schering’s later editorial remarks on the missing eighth section. Official/archival carrier: https://archive.org/details/disquisitionesa00gaus. Independent: https://mathshistory.st-andrews.ac.uk/Biographies/Gauss/ and the companion Disquisitiones extra page at the same MacTutor house. The records establish year, printer, and scope of seven sections. They do not establish a unique later number-theory citation coefficient. A contradictory 1801 title page without Gauss’s name would change the row.

Official or archival record: Disquisitiones Arithmeticae — 1801 Latin edition (https://archive.org/details/disquisitionesa00gaus; Internet Archive).

## Significance

Improving education path: a copyable systematic book. High confidence on 1801. Modest-to-medium weight: one treatise is not a ministry syllabus, but it did become the language of a field. Unpublished remainder and ducal dedication are other signs. Later probability named ‘Gaussian’ is not this book. Sophie Germain’s later reading of the work is a neighbouring rights path, not this colophon.

Confidence is stated on the impact path, not hidden in adjectives. 1801 book is not a later Gaussian integer textbook and not an unpublished eighth section. Mixed effects of Fleischer in Leipzig publishes Disquisitiones Arithmeticae are separate paths.

## What is established and what is not

Established: Disquisitiones Arithmeticae was published in Leipzig in 1801 as Gauss’s seven-section treatise. Not established: that the eighth section was printed then, or that every later algebra of integers is this octavo. A showing of a different first-edition year would change the row. A 1870 academy reprint would not.

Shared responsibility is part of Fleischer in Leipzig publishes Disquisitiones Arithmeticae. Naming Carl Friedrich Gauss does not delete co-authors, institutions, or later transmitters. The lag from 1801-08-01 to any measured indicator is not treated as zero. Alternative explanations — weather, other armies, later statutes, or independent cultural change — remain live where the sources do not close them.

The attached driver is edu-[digital-learning-access](/drivers/edu-digital-learning-access). The welfare reading used in this dossier is improving. That reading is an impact-path choice, not a property stored on the Fact itself.

If a number is not in the two records named above, it is not supplied here.

## People

- Carl Friedrich Gauss: https://factrail.ai/people/carl-friedrich-gauss

## Drivers

- Digital Learning Access: https://factrail.ai/drivers/edu-digital-learning-access

## Sources

- https://archive.org/details/disquisitionesa00gaus
- https://mathshistory.st-andrews.ac.uk/Biographies/Gauss/

## Methodology

https://factrail.ai/methodology

Canonical: https://factrail.ai/facts/gs-disquisitiones-1801