4 credits each Topics are offered as needed. Prerequisites vary. Repeat credit is offered for distinct topics. Topics offered regularly are distinguished with an alpha character: MTH 421A (Applied Complex Variables), MTH 421B (Optimization), MTH 421C (Partial Differential Equations), MTH 421D (Mathematical Modeling), MTH 421E (Numerical Linear Algebra), MTH 421F (Adaptive Signal Analysis and Processing).