In both formal and informal logic, a main contention is a thought which is capable of being either true or false and is usually the most controversial proposition being argued for. In reasoning, a main contention is represented up the top of an argument map, with all supporting and objecting premises which bear upon it placed underneath a sink. Logic (from ancient Greek λόγος (logos), meaning reason) is the study of arguments. ... Informal logic is the study of arguments as presented in ordinary language, as contrasted with the presentations of arguments in an artificial (technical) or formal language (see formal logic). ... An Argument map is a visual representation of the structure of an argument in informal logic. ...
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