We are executive members who pays $100/year. We also get cash back for every purchase and we pretty much get the membership fee back every year. We are a family of four and we buy most of our home supplies from Costco plus other stuffs. We love Costco but you have to know what you are buying.
Undefined is a term used when a mathematical result has no meaning. More precisely, undefined values occur when an expression is evaluated for input values outside of its domain. ( 1 if no complex numbers) ( 2 if no complex numbers) ( units in radians, no complex infinity)
Now to your three ways of understanding undefined in the realm of division by 0: 1  If a0 could be any number, say =13, then this would enforce 13â0=a, which is wrong when aâ 0. 2  This is even worse. 3  There are circumstances where division by zero makes sense, e.g. in connection with maps of the Riemann sphere, or with meromorphic functions.