M. Ackerman

Sophus Lie's 1884 differential invariant paper

Proceedings

And Then There Was WAWT

WAWT's on Full

WAWT Gets a Voice

Going, Going, Gone... but Not Forgotten

WAWT's Away

WAWT and the Cincinnati Daddy

Finding WAWT Relatives

Out of the Mailbox

Sophus Lie's 1880 transformation group paper