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Definition:
The concept of dictum de
omni et nullo is an axiom which constitues a logical premise of any logical syllogism.
In English, it can best be stated as: "What is affirmed of a logical whole may
be affirmed of a logical part of that whole; and what is denied of a logical whole
may be denied of a logical part of that whole."
Thus, if we can affirm of the logical category "human" that humans are mortal, then we can also affirm that any member of that category is also mortal. Or, if we can deny that the logical category "cats" can be characterized as reptilian, then we can deny that any member of that category is a reptile.
Also Known As: none
Alternate Spellings: none
Common Misspellings: none
Related Resources:
What is an Argument?
It helps to know what, exactly, an argument is before you can critique one and tell what is wrong with it. Sometimes, people say they are making arguments when they are not!How do you critique an argument?
Assuming that we have established that we have an actual argument, the next step is to examine it for validity. There are two points on which an argument might fail: its premises or its inferences.What is a Fallacy?
Fallacies are defects in an argument - other than false premises - which cause an argument to be invalid, unsound or weak. By understanding what fallacies are, you can avoid making them and more easily detect them in the work of others.Index of Fallacies
Known logical fallacies listed in categories and explained as to why they are defects in arguments as opposed to valid reasoning. Examples are included so that you can better see what is happening.
