###### Partial Differential Equations

(textbook for APM 346)

###### Asymptotic and Perturbational Methods

(textbook for APM 441)

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# Asides

## My Online Textbooks

###### Partial Differential Equations

###### Asymptotic and Perturbational Methods

## My Research Monograph

###### Microlocal Analysis, Sharp Spectral Asymptotics and Applications

## Testing mathjax

Victor Ivrii' Rumblings and Musings

Like it or hate itâ€”I don't care

(textbook for APM 346)

(textbook for APM 441)

My Research Monograph

and other texts are available from my website

Testing MathJax

Weyl’s law

\begin{equation*}

\mathsf{N}_h^-(\tau)\approx (2\pi h)^{-d}\iint _{\{(x,\xi)\colon H(x,\xi)<\tau\}} \,dxd\xi

\end{equation*}