We address the question of how much entanglement can be certified from the observed correlations and the knowledge of the Hilbert space dimension of the measured systems. We focus on the case in which both systems are known to be qubits. For several correlations (though not for all). one can certify the same amount of entanglement as with state tomography. https://www.markbroyard.com/limited-offer-annamaet-senior-rejuvenate-for-sale-flash-buy/