# Wilhelm Schlag's Webpage

**Source**: https://campuspress.yale.edu/willschlag/
**Parent**: https://campuspress.yale.edu/

/\* ── Scope Wrapper ── \*/<br /> .schlag-profile-v2 {<br /> font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;<br /> max-width: 900px;<br /> margin: 0 auto;<br /> padding: 3rem 2rem;<br /> color: #333;<br /> line-height: 1.6;<br /> }</p>
<p> /\* ── Header Area (Right Aligned) ── \*/<br /> .schlag-header-right {<br /> text-align: right;<br /> margin-bottom: 3.5rem;<br /> border-right: 5px solid #0056b3; /\* Visual accent on the right \*/<br /> padding-right: 1.5rem;<br /> }</p>
<p> .schlag-header-right h1 {<br /> font-family: 'Arial Black', 'Helvetica Neue', sans-serif; /\* Strong font \*/<br /> font-size: 2.8rem;<br /> color: #0056b3; /\* Requested Blue \*/<br /> margin: 0 0 0.5rem 0;<br /> line-height: 1.1;<br /> letter-spacing: -1px;<br /> }</p>
<p> .schlag-header-right h4 {<br /> font-size: 1.2rem;<br /> font-weight: 600;<br /> color: #555;<br /> margin: 0 0 0.2rem 0;<br /> }</p>
<p> .schlag-header-right p {<br /> margin: 0;<br /> color: #666;<br /> font-size: 0.95rem;<br /> }</p>
<p> .dept-link-btn {<br /> display: inline-block;<br /> margin-top: 1rem;<br /> text-decoration: none;<br /> color: #0056b3;<br /> font-weight: 700;<br /> font-size: 0.9rem;<br /> border-bottom: 2px solid transparent;<br /> transition: all 0.2s;<br /> }</p>
<p> .dept-link-btn:hover {<br /> border-bottom-color: #0056b3;<br /> }</p>
<p> /\* ── Research Interests Section ── \*/<br /> .research-section {<br /> margin-bottom: 3rem;<br /> }</p>
<p> .research-title {<br /> font-size: 2.2rem; /\* Larger \*/<br /> color: #0056b3; /\* Blue \*/<br /> font-weight: 700;<br /> border-bottom: 2px solid #e0e0e0;<br /> padding-bottom: 0.5rem;<br /> margin-bottom: 2rem; /\* Added space before list \*/<br /> }</p>
<p> .research-grid {<br /> display: grid;<br /> grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));<br /> gap: 1rem;<br /> padding: 0;<br /> list-style: none;<br /> }</p>
<p> .research-grid li {<br /> background-color: #f8f9fa;<br /> padding: 1rem 1.2rem;<br /> border-radius: 6px;<br /> border-left: 4px solid #0056b3;<br /> font-size: 1rem;<br /> font-weight: 500;<br /> display: flex;<br /> align-items: center;<br /> transition: transform 0.2s ease;<br /> }</p>
<p> .research-grid li:hover {<br /> transform: translateX(5px);<br /> background-color: #f0f4f8;<br /> }</p>
<p> /\* ── Teaching Section ── \*/<br /> .teaching-card {<br /> background: linear-gradient(to right, #f4f8fb, #fff);<br /> border: 1px solid #dceefc;<br /> border-radius: 8px;<br /> padding: 1.5rem 2rem;<br /> display: flex;<br /> align-items: center;<br /> justify-content: space-between;<br /> flex-wrap: wrap;<br /> gap: 1rem;<br /> box-shadow: 0 4px 12px rgba(0,0,0,0.03);<br /> }</p>
<p> .teaching-label {<br /> font-size: 1.1rem;<br /> font-weight: 700;<br /> color: #0056b3;<br /> display: flex;<br /> align-items: center;<br /> gap: 0.5rem;<br /> }</p>
<p> .teaching-links {<br /> display: flex;<br /> gap: 1rem;<br /> }</p>
<p> .teaching-btn {<br /> padding: 0.5rem 1.2rem;<br /> border-radius: 50px;<br /> text-decoration: none;<br /> font-weight: 600;<br /> font-size: 0.9rem;<br /> transition: all 0.2s;<br /> }</p>
<p> .btn-current {<br /> background-color: #e3f2fd; /\* Light Blue bg \*/<br /> color: #0d47a1;<br /> }<br /> .btn-current:hover { background-color: #bbdefb; }</p>
<p> .btn-past {<br /> background-color: #f5f5f5;<br /> color: #616161;<br /> }<br /> .btn-past:hover { background-color: #eeeeee; color: #333; }</p>
<p> /\* Mobile tweak \*/<br /> @media (max-width: 600px) {<br /> .research-grid { grid-template-columns: 1fr; }<br /> .schlag-header-right { text-align: left; border-right: none; border-left: 5px solid #0056b3; padding-left: 1rem; }<br /> .teaching-card { flex-direction: column; align-items: flex-start; }<br /> }<br /> 

Research Interests

- Linear and nonlinear wave equations.
- Stability of solitons and topological solitons.
- Spectral theory of differential operators and the distorted Fourier transform.
- Spectral theory of lattice Schrödinger operators with quasiperiodic potentials.
- Computer assisted proofs in differential equations and spectral problems.
- Classical and harmonic analysis.

Teaching at Yale: [Current Courses](https://courses.yale.edu/?keyword=schlag&srcdb=202601) and [Past Courses](https://courses.yale.edu/?keyword=schlag&srcdb=999999)