E-isms

Essentialism is the philosophical theory based on the concept that for any specific entity there is a set of attributes which are necessary to its identity and function. Proof: how else could we communicate via language?

Empericism is the philosophical theory that hypothesises that all knowledge is based on experience derived from the senses. Proof: computers have none.

Existentialism is ​the philosophical theory based on the existence of the individual person as a free and responsible agent determining their own development through acts of the will. Proof: why else would certain Parisian cafes have been full after the war?

Extensionalism is the philosophical theory based on the principle that the true meaning of life is the acquisition and retention of real estate. Proof: just ask any Sydney-sider.