% USPCONJ Conjecture for the smallest zero of ultraspherical polynomials
%
function lam0=uspconj(n,dl)
eps0=1e2*eps; lam=1; k0=0;
while k0==0
  lam=lam+dl;
  k0=uspineq(n,lam);
end
lr=lam; ll=lam-dl;
while lr-ll>eps0
  lam0=.5*(ll+lr);
  k0=uspineq(n,lam0);
  if k0>0
    lr=lam0;
  else
    ll=lam0;
  end
end