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What (who) is operator interception - definition

RETRIEVAL OF MAIL INTENDED FOR SOMEONE ELSE, FOR ESPIONAGE PURPOSES

Mail interception

Transfer operator

PUSHFORWARD ON THE SPACE OF MEASURABLE FUNCTIONS

Ruelle operator; Perron-Frobenius operator; Perron-Frobenius Operator; Frobenius-Perron operator; Bernoulli operator; Ruelle-Frobenius-Perron operator; Frobenius–Perron operator; Perron–Frobenius operator

In mathematics, the transfer operator encodes information about an iterated map and is frequently used to study the behavior of dynamical systems, statistical mechanics, quantum chaos and fractals. In all usual cases, the largest eigenvalue is 1, and the corresponding eigenvector is the invariant measure of the system.

https://en.wikipedia.org/wiki/Transfer_operator

Del

VECTOR'S DIFFERENTIAL OPERATOR

Nabla constant; Atled; Nabla operator; Del operator; Vector differential; Vector differential operator; Gradient operator; Divergence operator

Del, or nabla, is an operator used in mathematics (particularly in vector calculus) as a vector differential operator, usually represented by the nabla symbol ∇. When applied to a function defined on a one-dimensional domain, it denotes the standard derivative of the function as defined in calculus.

https://en.wikipedia.org/wiki/Del

Del

VECTOR'S DIFFERENTIAL OPERATOR

Nabla constant; Atled; Nabla operator; Del operator; Vector differential; Vector differential operator; Gradient operator; Divergence operator

·noun Share; portion; part.

Wikipedia

Postal interception

Postal interception is the act of retrieving another person's mail for the purpose of either ensuring that the mail is not delivered to the recipient, or to spy on them.

For instance, the American Central Intelligence Agency (CIA) and Federal Bureau of Investigation (FBI) were involved in numerous large-scale operations targeting US activist groups, whose mail was opened and photographed. In one such programme, over 215,000 letters were opened. In the United Kingdom, the Special Investigations Unit of the General Post Office was responsible for postal interception.

Since 2002, the United States Postal Service photographs the outside of all mail, retains those images for weeks or months, and provides them to police or other investigators upon a simple request.

https://en.wikipedia.org/wiki/Postal interception