Recent studies show that many workers consider their jobs socially useless. Thus, several explanations for this phenomenon have been proposed. David Graeber’s ‘bullshit theory’, example, claims some are in fact objectively useless, and these found more often certain occupations than others. Quantitative research on Europe, however, finds little support theory alienation may be better suited to ...

Model checking is one of the most practical techniques of automatic formal verification to ensure the correctness of design specifications. The problem that the number of states can become too large for model-checking real-time system is known as the state-space explosion problem. An optimization definition of clock equivalence, the key to model checking real-time, was described for model check...

Quantum Entanglement It has been shown that entanglement is not necessary for ancilla-assisted quantum process tomography. Surprisingly, by presenting two examples of two-qutrit entangled states, it found Cheng-Jie Zhang and co-workers in article number 2100550 there also exist some states which are useless Moreover, experimental verification performed on the IBM platform ibmq_athens.