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  2. Lepton number - Wikipedia

    en.wikipedia.org/wiki/Lepton_number

    In particle physics, lepton number (historically also called lepton charge) [1] is a conserved quantum number representing the difference between the number of leptons and the number of antileptons in an elementary particle reaction. [2]

  3. C character classification - Wikipedia

    en.wikipedia.org/wiki/C_character_classification

    C character classification is a group of operations in the C standard library that test a character for membership in a particular class of characters; such as alphabetic, control, etc. Both single-byte, and wide characters are supported.

  4. C file input/output - Wikipedia

    en.wikipedia.org/wiki/C_file_input/output

    The C programming language provides many standard library functions for file input and output.These functions make up the bulk of the C standard library header <stdio.h>. [1] The functionality descends from a "portable I/O package" written by Mike Lesk at Bell Labs in the early 1970s, [2] and officially became part of the Unix operating system in Version 7.

  5. List of file signatures - Wikipedia

    en.wikipedia.org/wiki/List_of_file_signatures

    Microsoft compressed file in Quantum format, used prior to Windows XP. File can be decompressed using Extract.exe or Expand.exe distributed with earlier versions of Windows. After compression, the last character of the original filename extension is replaced with an underscore, e.g. ‘Setup.exe’ becomes ‘Setup.ex_’. 46 4C 49 46: FLIF: 0 flif

  6. Pontecorvo–Maki–Nakagawa–Sakata matrix - Wikipedia

    en.wikipedia.org/wiki/Pontecorvo–Maki...

    In particle physics, the Pontecorvo–Maki–Nakagawa–Sakata matrix (PMNS matrix), Maki–Nakagawa–Sakata matrix (MNS matrix), lepton mixing matrix, or neutrino mixing matrix is a unitary [a] mixing matrix that contains information on the mismatch of quantum states of neutrinos when they propagate freely and when they take part in weak ...

  7. C data types - Wikipedia

    en.wikipedia.org/wiki/C_data_types

    Various rules in the C standard make unsigned char the basic type used for arrays suitable to store arbitrary non-bit-field objects: its lack of padding bits and trap representations, the definition of object representation, [7] and the possibility of aliasing. [12] The actual size and behavior of floating-point types also vary by implementation.

  8. Accidental symmetry - Wikipedia

    en.wikipedia.org/wiki/Accidental_symmetry

    The connection between symmetry and degeneracy (that is, the fact that apparently unrelated quantities turn out to be equal) is familiar in every day experience. Consider a simple example, where we draw three points on a plane, and calculate the distance between each of the three points.

  9. Object file - Wikipedia

    en.wikipedia.org/wiki/Object_file

    For example, OS/360 and successors call the first format a load module and the second an object module. In this case the files have entirely different formats. [2] DOS and Windows also have different file formats for executable files and object files, such as Portable Executable for executables and COFF for object files in 32-bit and 64-bit ...