What is the basis for the distinction between small tefachim and standard tefachim in these measurements?

SukkotPesachSukkot

Synopsis

The small tefach (tefach katan) is derived from proportionally dividing a five-tefach amah into six parts, creating a tefach smaller than the standard tefach; a standard tefach contains four godel while a small tefach contains less than four godel.

Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

Discussion

Discussion coming soon.

The Daily Law

One question. Every opinion. Every morning.

A new halakhic question and the full spectrum of rabbinic thought, delivered daily.