# Plague-year withdrawal to Woolsthorpe is the received setting of early calculations, not a dated book

Date: 1666

## The fact

In 1665–66 Newton left plague-closed Cambridge for Woolsthorpe. Later lives and his own recollections place early fluxion and optical work in those years. No public book is dated 1666. Isaac Newton's documented role is: He left plague Cambridge for Woolsthorpe and later described early fluxions and optical work from those years. The public books are 1687 and 1704.

## Context

The University closed. Trinity paid a scholar. Sharing recollection with later Newton is required; contribution is complex. The setting of Plague-year withdrawal to Woolsthorpe is the received setting of early calculations, not a dated book is the public file around 1666-01-01. Shared offices, unnamed crews, printers, or later editors may appear without becoming this instrument. Driver infectious-disease-transmission is attached because the significance names a mechanism from this act, not because a standing list needed coverage.

Shared responsibility is part of Plague-year withdrawal to Woolsthorpe is the received setting of early calculations, not a dated book. Naming Isaac Newton does not delete co-authors, institutions, or later transmitters. The lag from 1666-01-01 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.

## Evidence and sources

Britannica independently narrates the plague-year withdrawal. The Newton Project edits early papers as later carriers. Official carrier: The Newton Project — early mathematical papers and plague-year context (https://www.newtonproject.ox.ac.uk/; The Newton Project / University of Oxford). Independent carrier: Britannica — Newton, plague years, Woolsthorpe (https://www.britannica.com/biography/Isaac-Newton; Encyclopaedia Britannica).

Official or archival record: The Newton Project — early mathematical papers and plague-year context (https://www.newtonproject.ox.ac.uk/; The Newton Project / University of Oxford).

## Significance

Worsening infectious-disease path: plague closed Cambridge and forced a research withdrawal. The later books are not this 1666 imprint. Medium confidence on any unique coefficient; high on the closure. The welfare reading on this path is worsening.

## What is established and what is not

Established: Cambridge closed and Newton was at Woolsthorpe. Not established: a unique 1666 theorem title page, or a falling-apple autograph. Established: a sourced public record of Plague-year withdrawal to Woolsthorpe is the received setting of early calculations, not a dated book under 1666-01-01.

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

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

Confidence is stated on the impact path, not hidden in adjectives. Do not print an apple as a Fact. Do not antedate Principia to 1666. Mixed effects of Plague-year withdrawal to Woolsthorpe is the received setting of early calculations, not a dated book are separate paths.

The attached driver is infectious-disease-transmission. The welfare reading used in this dossier is worsening. That reading is an impact-path choice, not a property stored on the Fact itself.

## People

- Isaac Newton: https://factrail.ai/people/isaac-newton

## Drivers

- Infectious-Disease Transmission: https://factrail.ai/drivers/infectious-disease-transmission

## Sources

- https://www.newtonproject.ox.ac.uk/
- https://www.britannica.com/biography/Isaac-Newton

## Methodology

https://factrail.ai/methodology

Canonical: https://factrail.ai/facts/newton-plague-years-received