Default sorting Sort by popularity Sort by average rating Sort by latest Sort by price: low to high Sort by price: high to low View: 12 24 All Quick View Sale! Quick View MathematicsSpectral Theory: Basic Concepts and Applications by David Borthwick, ISBN-13: 978-3030380014 $50.00 Original price was: $50.00.$14.99Current price is: $14.99. Add to cart