lim n → ∞ → + ∑ n = 1 ∞ → B a s i s ↙ ↘ ↑ − ↓ ÷ T a y l o r ↓ × F o u r i e r ← ⟨ ⋅ , ⋅ ⟩ ↗ ↗ ↕ f ′ ( x ) ⟷ f ∫ f ( x ) d x → F u n c t i o n a l ← ‖ ⋅ ‖ ∇ ↓ ↘↘ ↙ ↓ ∗ ∫ Ω = ∮ ∂ Ω δ L [ y ] C o n v o l u t {\displaystyle {\begin{array}{lcl}&\displaystyle \lim _{n\to \infty }&&\color {Green}\xrightarrow {+} &&\;\;\displaystyle \sum _{n=1}^{\infty }&&&\color {Cyan}\xrightarrow {} &\color {Cyan}Basis\\&&&&\color {Magenta}\swarrow &&\color {Red}\searrow &&&\color {Cyan}\uparrow \\&\color {Green}-{\bigg \downarrow }\div &&\color {Magenta}Taylor&&\quad \color {Green}{\bigg \downarrow }\times &&\color {Red}Fourier&\color {Red}\leftarrow &\langle \cdot ,\cdot \rangle \\&&\;\color {Magenta}\nearrow &&&&\color {Red}\nearrow &&&\updownarrow {}\\&f^{\prime }(x)&&\;\;{\underset {f}{\longleftrightarrow }}&&\displaystyle \int f(x)dx&\color {Orange}\rightarrow &\color {Orange}Functional&\color {Orange}\xleftarrow {} &\lVert \cdot \rVert \\&\color {Plum}\nabla {\bigg \downarrow }&\color {NavyBlue}\searrow \searrow &&\color {NavyBlue}\swarrow &\color {Plum}\quad {\bigg \downarrow }*\\&\color {Plum}\displaystyle \int _{\Omega }=\oint _{\partial \Omega }&&\;\color {NavyBlue}\delta \,L[y]&&\color {Plum}Convolut\end{array}}}