Vector Fields in Maple. A vector field is described by a function that takes each point of the plane to a vector. > with(linalg): > F := (x,y) -> [-y,x]; We can evaluate this function at a point by plugging in values for x and y , just like we do with functions whose values are scalars.
The survey of U.S. parents finds that out of children participating in Fall and Winter sports, just 60 percent are wearing mouth guards. Taking a closer look at mouth guard usage for some higher-impact sports, the survey shows that for football, just 32 percent of parents report their child wears a mouth guard, for field hockey, just 14 percent. Lacrosse and ice hockey both fall at 11 percent, alongside volleyball. The complete list can be found here.
Hereâs why the anti-vaxxers are wrong and Caplan and his co-authors are right to raise the idea of suing or criminally charging them: Parents who choose not to vaccinate their kids for reasons of personal belief pose a serious danger to the public. Measles vaccines are about 95 percent effective when given to children.hen again, to win damages, a plaintiff would only have to prove that itâs âmore likely than notâ that a nonvaccinated child infected another person. Parents who donât vaccinate their kids may have the most heartfelt reason in the world: fear for their own childrenâs safety.