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Writing guides, especially for technical writing, usually advise avoiding redundancy, "especially the use of two expressions that mean the same thing. Such repetition works against readability and conciseness." [4] Others make a distinction between redundancy and repetition: Repetition, if used well, can be a good tool to use in your writing.
"Don't repeat yourself" (DRY), also known as "duplication is evil", is a principle of software development aimed at reducing repetition of information which is likely to change, replacing it with abstractions that are less likely to change, or using data normalization which avoids redundancy in the first place.
Repetition codes, such as Triple modular redundancy; Spinal code, a rateless, nonlinear code based on pseudo-random hash functions [32] Tornado code, a near-optimal erasure correcting code, and the precursor to Fountain codes; Turbo code; Walsh–Hadamard code
The additional data can simply be a complete copy of the actual data (a type of repetition code), or only select pieces of data that allow detection of errors and reconstruction of lost or damaged data up to a certain level.
the information entropy and redundancy of a source, and its relevance through the source coding theorem; the mutual information , and the channel capacity of a noisy channel, including the promise of perfect loss-free communication given by the noisy-channel coding theorem ;
It reduces overall essay quality. Multiple essays on the same topic spreads the work that could have been done on one page across several pages, leading to repetition and lack of depth. It's better to have one longer, high quality essay than many short essays. Detracts from expansion. Writing redundant essays diverts time and resources away ...
Reduplication can convey emphasis or repetition, for example mate "die", matemate "die in numbers"; and de-emphasis, for example wera "hot" and werawera "warm". Reduplication can also extend the meaning of a word; for instance paki "pat" becomes papaki "slap or clap once" and pakipaki "applaud"; kimo "blink" becomes kikimo "close eyes firmly"
The quantity is called the relative redundancy and gives the maximum possible data compression ratio, when expressed as the percentage by which a file size can be decreased. (When expressed as a ratio of original file size to compressed file size, the quantity R : r {\displaystyle R:r} gives the maximum compression ratio that can be achieved.)