SYMBOL OF AN EXPRESSION SATISFYING INEQUALITIES

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idriskameni
idriskameni 2019-3-5
回答： Walter Roberson 2019-3-5
I would like to check if
2/(d + g + 2*r + 1) - 4 >=0
or not.
But I would like to know it when r,g,d satisfy
  1. r+g-d>=0
  2. nchoosek(r+2,2) >= 1+2*d-g
  3. g-(r+1)*(r+g-d)-(nchoosek(r+2,2)-2*d+g)>=0
And moreover, the value I get here
answer = inputdlg('Enter the value of N in the formula',...
'Sample', [1 50]);
N = str2num(answer{1,1});
I would also like to assume that
  1. N=nchoosek(r+2,2) -2*d+g
Does anyone knows how can I see which sign has my expression
assuming these 4 things I have mentioned above?

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采纳的回答

Walter Roberson
Walter Roberson 2019-3-5
No, that test is not always true under those conditions . nchoosek is not defined for negative or fractional inputs but the test you want obviously fails if you constrain to nonnegative integers so we must assume that your variables are over the reals rather than nonnegative integers .

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