Question: is(...) / if with assuming...

From the forum message  HERE , I learned about both  is(...)  and  assuming...  and became interested in how they work together as compared with the way that  if  and  assuming...  worked together. Finally using the combination of  if  and  assuming...  to find the place at which  n of  x^2-n  needs to be within a range of .1 to 1 with a resolution of  .01 and with x=-1..1 I found that using if with assuming the return is true if any condition satisfies the test I found that using is with assuming the return is true if all conditions satisfies the test Below is an HTML page which also contains a link to a  Maple 11  worksheet archive, if anyone is interested in seeing what I did. is_if_DOC.html
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