Known for his work on logical investigations and phenomenology, Edmud Husserl originally trained as a mathematician before studying philosophy and becoming a teacher of the subject. You can see how this influences his work; similar to Descartes, he has a methodical approach to thinking and his theory of phenomenology involves careful introspective study of psychological behaviour (such as dreams, thoughts, concepts). 

Husserl’s work focuses on how reality appears to us, rather than attempting to ascertain what reality involves. All thought is ‘intentional’, or directed towards some object, leading to the object of thought (or noema) being separate from the act of consciousness (the noesis). Numbers, ideas, all were investigated in order to ascertain the essential and necessary elements of these concepts.

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