Mathias Caspar Hubert Isenkrahe (May 12, 1844 in Müntz near Jülich – August 12, 1921 in Trier) was a German mathematician, physicist and catholic philosopher of nature.
Caspar David Friedrich | Caspar Weinberger | Caspar Whitney | Caspar Schoppe | Caspar Hedio | Caspar Bartholin the Elder | Karl Caspar | Johann Caspar Füssli | Johan Caspar von Cicignon | Horst Caspar | Georg Caspar Schürmann | Caspar Wolf | Caspar Schwenckfeld | Caspar Peter Hagerup | Caspar Neher | Caspar John | Caspar de Crayer | Caspar Bartholin the Younger | Caspar Bartholin |