This does not mean that our method is useless.
In general, a more complex case is studying non-positive solutions to difference equations and systems, which is also the case for the product-type systems, since the previous method is useless because it produces multi-valued solutions.
Of course the trade-off between sensitivity and specificity should be kept in mind: a very sensitive method is useless when it is not specific enough and vice versa [ 29].
Given the lack of sufficient organic material buried around the tools, the radiocarbon dating method was useless.
On the European scene, Pierre Boulez declared that any musician who had not experienced the necessity of Schoenberg's methods was "USELESS".
While being very precise, signature-based methods are useless against unknown malicious code [9].
Classical methods are useless to interpolate the function that fails to be differentiable at one point, for example the absolute value function (f(x)) =(|x|) at (x) = 0.
For instance, many women considered that information from government institutions about "flood warnings" or use of "contaminated water" or "family planning methods" was useless, irrelevant, and not applicable to their life-world.
This method is hardware method.
This method is called the avalanche method.
