LeftDoubleBracket \[LeftDoubleBracket]
Alias: [[. Compound operator with built-in evaluation rules. m
i,j, ... is by default interpreted as Part[
m,i,j, ... ]. Sometimes used in mathematics to indicate a class of algebraic objects with certain variables or extensions. Extensible character; grows by default to limited size. See The Mathematica Book: Section 1.10.4, Section 3.10.4. See also: \[RawLeftBracket], \[LeftDoubleBracketingBar].
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\[LeftDoubleBracket]
[[
is by default interpreted as Part[
