2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/114547We compare the polynomial invariants for four qubits introduced by Luque and Thibon, PRA {\bf 67}, 042303 (2003), with optimized Bell inequalities and a combination of two qubit concurrences. It is shown for various parameter dependent states from different SLOCC classes that it is possible to measure a genuine 4-qubit entanglement with these polynomials.4 pages, 4 figuresQuantum Physicstext