Non-unique weak solutions to periodic k-gKdV are constructed via convex integration in low-regularity spaces with zero initial data, establishing that nonlinearity integrability is necessary for unconditional uniqueness.
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Non-unique solutions to the periodic gKdV equation
Non-unique weak solutions to periodic k-gKdV are constructed via convex integration in low-regularity spaces with zero initial data, establishing that nonlinearity integrability is necessary for unconditional uniqueness.