Can we say that "all functions in Mathematica are some kind of pattern-matching-and-replacement procedures"?
95524
Is everything in Mathematica ultimately stored as a rule?
97552
Is there a general way to parameterize all implicit functions?
126631
Quick way to use conditioned patterns when defining multi-argument function?
76162
Does Scala's pattern matching violate the Open/Closed Principle?
146152
Characterising functions $f$ that can be written as $f = g \circ g$?
56441
Conventions for function notation
47223
Deriving even odd function expressions
107281
Proof of Existence of Algebraic Closure: Too simple to be true?
15947
Validity of Substitutions in Integrals
152438
Is the composition of two injective functions injective?
39332
Are "(function ( ) { } ) ( )" and "(function ( ) { } ( ) )" functionally equal in JavaScript?
86064
Argument completions for user-defined functions
57938
When do two functions become equal?
66975
Can Mathematica identify formulae or sequences of numbers?
145781
Is the collection of all functions between two sets a set?
136996
Fourier transform of function composition
115628
Converting expressions into functions