Nexus means union, connection, bond. It is a masculine noun that names that which has joining, adhesion, connection.
have nexus it is having coherence, having a harmonious connection between ideas, situations and events. It's having rationality, that is, it's making use of reason.
talk with nexus it is to speak in a well-ordered way, it is to speak with meaning, with connection and logic, It is to have consonance in what you want to express.
the absence of nexus or logic can represent a paradox, that is, an opinion contrary to the common. For example: "The more we give, the more we receive." “The best improvisation is the one that is best prepared”.
No nexus or zero nexus are expressions used to indicate that something is meaningless, that it is being presented without logic, without coherence.
causal nexus
Casual nexus is an expression used in the legal field, where the cause is linked to the result. It is the relationship between the agent's conduct and the result it produces. Examining the causal link is to discover which positive or negative behaviors gave rise to the result provided for by law. If there is no "conditio sine qua non", there is no causal link.
Technical Epidemiological Nexus
The Epidemiological Technical Nexus (NET) is a methodology that consists of identifying accidents or illnesses that are related to the practice of a certain activity performed by the worker. The use of the NET methodology allows characterizing whether the illness contracted by the worker is directly related to the work accident.
From the crossing of information, upon detecting a statistical correlation between the illness or injury suffered by the worker and the sector of activity economic situation in which he is included, the methodology automatically points out that the worker will be included in the accident benefit and not in the benefit normal social security.
By adopting the Epidemiological Technical Nexus the company will be able to prove that the accidents and illnesses at work were not caused by the activity performed by the worker, therefore, the obligation of proof becomes the employer and no longer the employee. Until the entry into force of the methodology, upon suffering an accident or contracting illness, the worker or the INSS, were responsible for proving that the diseases had been caused by the activity then performed.