A Novel Necessary and Sufficient Condition for the Positivity of a Binary Quartic Form

Table 3

Properties of and .

Case^a	Property of , ,	Property of and
1		,
2	or	,
3		is nonreal or or ,
4	or	,
5		,
6		,
7		,
8		,
9		,

^aCorresponding to Tables 1 and 2.