Evaluation of Syllogisms

Evaluation of syllogisms in terms of modified Venn diagrams

S

P

M

Choose the syllogism you want to analyse (use the menus). Update the diagram by changing some or all of the ?’s to + or -. Try to obtain true premises and a true negated conclusion. If this can be done the argument will be invalid. If it can’t be done the argument is valid.

Evaluates to true?

Premise 1:

Premise 2:

Conclusion:

Negated Conclusion: --