package org.orekit.estimation;
import org.hipparchus.analysis.UnivariateFunction;
<BUG>import org.hipparchus.analysis.UnivariateVectorFunction;
import org.hipparchus.analysis.differentiation.DerivativeStructure;</BUG>
import org.hipparchus.analysis.differentiation.FiniteDifferencesDifferentiator;
import org.hipparchus.analysis.differentiation.UnivariateDifferentiableFunction;
import org.hipparchus.analysis.differentiation.UnivariateDifferentiableVectorFunction;

package org.orekit.estimation;
import org.hipparchus.analysis.UnivariateFunction;
import org.hipparchus.analysis.UnivariateVectorFunction;
import org.hipparchus.analysis.differentiation.DSFactory;
import org.hipparchus.analysis.differentiation.DerivativeStructure;
import org.hipparchus.analysis.differentiation.FiniteDifferencesDifferentiator;
import org.hipparchus.analysis.differentiation.UnivariateDifferentiableFunction;
import org.hipparchus.analysis.differentiation.UnivariateDifferentiableVectorFunction;
