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2. Trace (linear algebra) - Wikipedia

   en.wikipedia.org/wiki/Trace_(linear_algebra)

   Trace (linear algebra) In linear algebra, the trace of a square matrix A, denoted tr (A), [ 1] is defined to be the sum of elements on the main diagonal (from the upper left to the lower right) of A. The trace is only defined for a square matrix ( n × n ). In mathematical physics texts, if tr (A) = 0 then the matrix is said to be traceless.

3. Genealogical numbering systems - Wikipedia

   en.wikipedia.org/wiki/Genealogical_numbering_systems

   The number of a person's father is twice their own number, and the number of a person's mother is twice their own, plus one. For instance, if John Smith is 10, his father is 20, and his mother is 21, and his daughter is 5. In order to readily have the generation stated for a certain person, the Ahnentafel numbering may be preceded by the ...

4. Trace class - Wikipedia

   en.wikipedia.org/wiki/Trace_class

   Trace class. In mathematics, specifically functional analysis, a trace-class operator is a linear operator for which a trace may be defined, such that the trace is a finite number independent of the choice of basis used to compute the trace. This trace of trace-class operators generalizes the trace of matrices studied in linear algebra.

5. AOL Mail

   mail.aol.com

   You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

6. Voice for Baloch Missing Persons - Wikipedia

   en.wikipedia.org/wiki/Voice_for_Baloch_Missing...

   [10] The VBMP takes responsibility for pushing the Supreme Court of Pakistan to order that police stations issue First Information Reports demanded by families of the missing in 2010. In the same period, the VBMP was pushing the Supreme Court of Pakistan to take "suo motu" notice of missing persons in Balochistan. [11]

7. Sheet resistance - Wikipedia

   en.wikipedia.org/wiki/Sheet_resistance

   Sheet resistance is the resistance of a square piece of a thin material with contacts made to two opposite sides of the square. [ 1] It is usually a measurement of electrical resistance of thin films that are uniform in thickness. It is commonly used to characterize materials made by semiconductor doping, metal deposition, resistive paste ...

8. List of TCP and UDP port numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_TCP_and_UDP_port...

   The port numbers in the range from 0 to 1023 (0 to 2 10 − 1) are the well-known ports or system ports. [3] They are used by system processes that provide widely used types of network services. On Unix-like operating systems, a process must execute with superuser privileges to be able to bind a network socket to an IP address using one of the ...

9. S10 (UPU standard) - Wikipedia

   en.wikipedia.org/wiki/S10_(UPU_standard)

   The UPU S10 standard defines a system for assigning 13-character identifiers to international postal items for the purpose of tracking and tracing them during shipping . With increased liberalization and the possibility of multiple postal services operating in the same country, the use of country codes to designate the postal service is a problem.