ABSTRACT
Wilhelm Maria Frankl was born on 25 March 1878 in Graz, where he studied philosophy and classical philology. In 1902 he published a study on experimental psychology entitled 'The general tendency to judgement in value research' in Zeitschrift fur Psychologie und Physiologie der Sinnesorgane. Wilhelm Maria Frankl was influenced by the intellectual climate that engendered the Wiener Kreis. Frankl subsequently specified his definition of logic thus: 'Logic is the theory of formally correct and formally complete thought.' Frankl developed his own 'theory of the logical square,' and he also drew on classical logic to address the problem of causality. The theory of knowledge propounded by Frankl has broad implications. If the structure of reality is causal, if the continuity between cause and effect is universal, then the problem of free will disappears. Frankls logical investigations also influenced his theory of science. Every theory of science must rely on logical procedures.
