If email served no useful purpose, we wouldn't use it.
And if recessions served no useful purpose, it might be.
If they cannot get their advice accepted in the clinch – or, worse yet, if they have no useful advice to offer – the whole enterprise of economic scholarship has failed in its most essential duty.
A European-based follower of the Tibetan leader, who knows him well, explains the position thus: "If there is no useful role for him to play spiritually, educationally, culturally, then there is no point in [his] coming back as the 15th Dalai Lama".
Furthermore, if there is no "useful dependence information" between and, then by definition.
If there is no "useful information" (see Zitikis [6] for the meaning) about the location of the means and inside the intervals and, respectively, then the two information coefficients and are equal to by definition, and thus is equal to.
Flexible molecular docking operations require no prior knowledge of the ligand conformation and such an approach becomes necessary if there is no useful information on the conformation of a particular ligand.
If a newly-inserted gene is expressed, it imposes a cost of transcription and/or translation that will be detrimental to the cell if the gene product has no useful function.
If the columns are no longer useful (which can be several years after making them) you can use them to grow things in their sides such as ferns, creepers, bromeliads or orchids (if the climate is right) and other plants, or they are easy to pull apart to use the soil elsewhere.
If it is useful, they use it.
