I was reading the following paper:
- Rolf Landauer, Irreversibility and Heat Generation in the Computing Process, IBM Journal of Research and Development, Volume 5, Issue 3, July 1961.
On page 4, Landauer gives a construction for a $3$-bit reversible gate. Though his argument for logical irreversibility turned out to be wrong, the gate is the same as the Toffoli gate.
Seeing as this paper was published in 1961, way before Toffoli's paper (circa 1980) which gave the Toffoli gate, I am curious as to why the gate is named after Toffoli and not Landauer.