Substitution
Encyclopedia
Substitution may refer to:

## Sciences

• Substitution (logic)
Substitution (logic)
Substitution is a fundamental concept in logic. Substitution is a syntactic transformation on strings of symbols of a formal language.In propositional logic, a substitution instance of a propositional formula is a second formula obtained by replacing symbols of the original formula by other formulas...

, a syntactic transformation on strings of symbols of a formal language
• Substitution of variables
Substitution of variables
In mathematics, substitution of variables refers to the substitution of certain variables with other variables....

• Substitution cipher
Substitution cipher
In cryptography, a substitution cipher is a method of encryption by which units of plaintext are replaced with ciphertext according to a regular system; the "units" may be single letters , pairs of letters, triplets of letters, mixtures of the above, and so forth...

, a method of encryption
• String substitution, a mapping of letters in an alphabet to languages
• Substitution method
Substitution method
In optical fiber technology, the substitution method is a method of measuring the transmission loss of a fiber. It consists of:#using a stable optical source, at the wavelength of interest, to drive a mode scrambler, the output of which overfills a 1 to 2 meter long reference fiber having...

, a method of measuring the transmission loss of a fiber
• Base-pair substitution or point mutation, a type of mutation
• Substitution, a process in which an allele arises and undergoes fixation
Fixation (population genetics)
In population genetics, fixation is the change in a gene pool from a situation where there exist at least two variants of a particular gene to a situation where only one of the alleles remains...

## Other uses

• Substitution (law)
Substitution (law)
In legal terms, the Right of Substitution is a statutory right of all parties except the State. It is the right to change the presiding court official with or without cause....

, the replacement of a judge
• Substitution (poetry)
Substitution (poetry)
In English poetry substitution is the use of an alien metric foot in a line of otherwise regular metrical pattern. For instance in an iambic line of "da DUM", a trochaic substitution would introduce a foot of "DUM da".-Trochaic substitution:...

, a variation in poetic scansion
• "Substitution" (song)
Substitution (song)
"Substitution" is a single by indie rock band Silversun Pickups, and is the second single from their second album, Swoon. Since its release, the song has reached number 17 and debuted at number 35 on Billboard Alternative Songs chart...

, a song by Silversun Pickups
• Substitution (sport), where a sports team is able to change one player for another during a match
• Substitution (theatre)
Substitution (theatre)
In theatre, substitution refers to the method of understanding elements in the life of one's character by comparing them to elements in one's own life. For example, if an actor is portraying a character who is being blackmailed, he or she could think back to some embarrassing or private fact about...

, an acting methodology

• Substitute (disambiguation)
• Integration by substitution
Integration by substitution
In calculus, integration by substitution is a method for finding antiderivatives and integrals. Using the fundamental theorem of calculus often requires finding an antiderivative. For this and other reasons, integration by substitution is an important tool for mathematicians...

, a method for finding antiderivatives and integrals
• Substitution therapy or opiate replacement therapy
• Substitution reaction
Substitution reaction
In a substitution reaction, a functional group in a particular chemical compound is replaced by another group. In organic chemistry, the electrophilic and nucleophilic substitution reactions are of prime importance...

, where a functional group in a chemical compound is replaced by another group
• Penal substitution
Penal substitution
Penal substitution is a theory of the atonement within Christian theology, developed with the Reformed tradition. It argues that Christ, by his own sacrificial choice, was punished in the place of sinners , thus satisfying the demands of justice so God can justly forgive the sins...

, a theory of the atonement within Christian theology
• Chord substitution
Chord substitution
In music theory, chord substitution is the use of a chord in the place of another related chord in a chord progression. Jazz musicians often substitute chords in the original progression to create variety and add interest to a piece. The substitute chord must have some harmonic quality and degree...

, the use of a chord in the place of another related chord
• Import substitution industrialization, a trade and economic policy
• Simultaneous substitution
Simultaneous substitution
Simultaneous substitution is a practice mandated by the Canadian Radio-television and Telecommunications Commission requiring Canadian cable, direct broadcast satellite and multichannel multipoint distribution service television distribution companies to substitute the signal of a foreign or...

, a practice requiring Canadian television distribution companies to substitute a non-local station signal with the local signal