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Create, delete, modify, copy, import, and export annotations; For example, Adobe Systems grants permissions to enable additional features in Adobe Reader, using public-key cryptography. Adobe Reader verifies that the signature uses a certificate from an Adobe-authorized certificate authority. Any PDF application can use this same mechanism for ...
A digital copy is a commercially distributed computer file containing a media product such as a film or music album. The term contrasts this computer file with the physical copy (typically a DVD , Blu-ray , Blu-ray 3D , or Ultra HD Blu-ray disc) with which the digital copy is usually offered as part of a bundle .
df (Unix), a Unix command to report disk space usage by a filesystem; Dairy free, identifying products that contain no milk; Decapacitation factor, in biochemistry; Degrees of freedom, various measures in statistics, mathematics and physics; Density function, a mathematical function with a wide range of applications; Dielectric loss
definition: is defined as metalanguage:= means "from now on, is defined to be another name for ." This is a statement in the metalanguage, not the object language. The notation may occasionally be seen in physics, meaning the same as :=.
df (abbreviation for disk free) is a standard Unix command used to display the amount of available disk space for file systems on which the invoking user has appropriate read access. df is typically implemented using the statfs or statvfs system calls .
Carbonless copy paper; Photographic processes: Reflex copying process (also reflectography, reflexion copying) Breyertype, Playertype, Manul Process, Typon Process, Dexigraph, Linagraph; Daguerreotype; Salt print; Calotype (the first photo process to use a negative, from which multiple prints could be made) Cyanotype; Photostat machine; Rectigraph
A copying clerk would begin by counting the number of master letters to be written during the next few hours and by preparing the copying book. Suppose the clerk wanted to copy 20 one-page letters. In that case, he would insert a sheet of oiled paper into the copying book in front of the first tissue on which he wanted to make a copy of a letter.
where df res is the degrees of freedom of the estimate of the population variance around the model, and df tot is the degrees of freedom of the estimate of the population variance around the mean. df res is given in terms of the sample size n and the number of variables p in the model, df res = n − p − 1. df tot is given in the same way ...