an unpublished letter from henry oldenburg to johann heinrich rahn
an unpublished letter from henry oldenburg to johann heinrich rahn
an unpublished letter from henry oldenburg to johann heinrich rahn
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Letter <strong>from</strong> Henry Oldenburg <strong>to</strong> Joh<strong>an</strong>n Heinrich Rahn 251<br />
Figure 1. Portrait of Henry Oldenburg by J<strong>an</strong> v<strong>an</strong> Cleef, 1668. (Copyright © The Royal Society.)<br />
taken: one by Thomas Br<strong>an</strong>cker, <strong>an</strong>d the other commissioned by John Collins. These two<br />
projects were combined in 1665, <strong>an</strong>d the tr<strong>an</strong>slation was then submitted <strong>to</strong> Pell for revision<br />
<strong>an</strong>d improvement; by the time this work was published as An Introduction <strong>to</strong><br />
Algebra in 1668, Pell’s interventions had amounted <strong>to</strong> replacing roughly half of Rahn’s<br />
text with new material of his own. 9 It was during the preparation of that modified tr<strong>an</strong>slation<br />
that Pell wrote <strong>to</strong> Haak (on 13 June 1666):