Update

zero.md

@@ -13,7 +13,7 @@ Some properties of and facts about this number follow:
 - Its representation in all traditional numeral systems is the same: 0.
 - 0^*x* (zero to the power of *x*), for *x* not equal to 0, is always 0.
 - *x*^0 (*x* to the power of 0), for *x* not equal to 0, is always 1.
-- 0^0 (0 to the power of 0) is **not defined**!
+- 0^0 (0 to the power of 0) is generally **not defined**! However sometimes it's convenient to define it as equal to 1.
 - In programming we start counting from 0 (unlike in real life where we start with 1), so we may encounter the term **zeroth** item. We count from 0 because we normally express offsets from the first item, i.e. 0 means "0 places after the first item".
 - It is, along with 1, one of the symbols used in [binary](binary.md) logic and is normally interpreted as the "off"/"false"/"low" value.
 - Its opposite is most often said to be the [infinity](infinity.md), even though it depends on the angle of view and the kind of infinity we talk about. Other numbers may be seen as its opposite as well (e.g. 1 in the context of [probability](probability.md)).