To see this, first check that 𝜎(X_0,X_1,…)=𝜎(ℱ_0), where ℱ_0:=∪ ᪲ₖ₌₀𝜎(X_0,…,X_k) is a field and, in particular, a boldsymbol 𝜋-system.

For many Muslim scholars and mystics, however, the Ṣūfism of al-Ḥallāj clearly steps out of the bounds of Islāmic orthodoxy, entering the abode of heterodoxy and even heresy.

The Polish word for cat is kot. Its genitive form is kota, which has the ending –a. Because the nominative form consists of the stem without an ending, it can be said that kot has the zero ending. In a table listing the endings one could hence write: Nominative: –∅, Genitive: –a.

Sporting a few war wounds from Japanese destroyer gunfire, The Sullivans had already launched one spread of torpedoes at the Japanese destroyers that were now littering the ocean floor, or, occasionally, making their own retreat, but she still had one left, so a five-torpedo spread was duly sent at near-point-blank range into the listing and burning remains of Yamato, and, shortly thereafter, four large geysers of water were the reward.