How could I define function with function such as Coefficient?
18315
What is the difference between Set and SetDelayed?
24862
Solving (quadratic) equations of iterated functions, such as $f(f(x))=f(x)+x$
44293
Functions satisfying $f\left( f(x)^2+f(y) \right)=xf(x)+y$
81757
How to include a linear and quadratic term when also including interaction with those variables?
122519
Multiplicative Functions
95023
Is it possible to annotate equations (i.e. arrow signs/curly braces) to define each variable?
70679
How to define a function in ghci across multiple lines?
69734
how to find all functions such that $f\left( x^{2} - y^{2} \right) = ( x - y )( f(x) + f(y) )$
122329
Determine all functions $f(x)$ such that $f(f(x+y))=f(x)+f(y)$
109942
Find continuous functions such that $f(x+y)+f(x-y)=2[f(x)+f(y)]$
115628
Converting expressions into functions
62440
Programming a numerical method in the functional style
62966
Find all functions $f(x)$ such that $f\left(x^2+f(y)\right)$=$y+(f(x))^2$
84228
What's the best way make an "augmented" coefficient matrix?
41810
Should all polynomial functions from F to F (F is a field) have coefficients in F?
56122
Is there any way to define pure functions with optional arguments?
51080
PGFPlots with function definition and then use it by replacing a constant