Symbolic Logic Directory References Discover Which Religion Is the Oldest? 7 Unique Burial Rituals Across the World 10 Best Hockey Players of All Time The World’s 5 Most Commonly Used Writing Systems Timeline of the Space Race, 1957–69 Nostradamus and His Prophecies How Did the Sperm Whale Get Its Name? Contents Symbolic Logic work by Lewis and Langford Ask the Chatbot a Question Ask the Chatbot a Question Learn about this topic in these articles:modality In modality… and Cooper Harold Langford in Symbolic Logic (1932), which develops a modal system of “strict implication” for interpreting the logical force of “if . . . then.”Read More