= Allen Hatcher
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<Allen Hatcher> authored a text in <algebraic topology>. Algebraic invariants such as the <fundamental group> and homology make global features of spaces accessible to calculation while respecting continuous deformation.<Algebraic Topology by Allen Hatcher>[author attribution and the described mathematical development]{ref}
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Allen_Hatcher,_circa_1980_(re-scanned,_as-is%3B_portion_B,_headshot).jpg?width=260]
{title=Portrait of <Allen Hatcher>}
{description=George M. Bergman; existing headshot crop of the Berkeley photograph, circa 1980. https://creativecommons.org/licenses/by-sa/4.0/[CC BY-SA 4.0], via Wikimedia Commons.}
{source=https://commons.wikimedia.org/wiki/File:Allen_Hatcher,_circa_1980_(re-scanned,_as-is%3B_portion_B,_headshot).jpg}
{width=260}
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