This web tool helps you finding the correct syllogism name for any combination of premisses and conclusion – or at least it will show you the formal fallacies which the chosen combination would commit.
For more information, please visit:
Hint: This page also works as web-app for smartphones!
Just chose “Add to Home screen” in the options menu (Android), or “Add to Home screen” in the “Share” menu ( iOS) to install it to your phone.
Other potential errors and fallacies
In addition to the formal fallacies pointed out by the app, other errors in thinking and reasoning can influence the conclusions. The most important problems to be aware of are listed here:
Note: The English version is still under construction! Many of the articles linked here either don’t exist yet (red links), or are still incomplete. They will be added as soon as possible.
Both, premises and conclusion, must be valid
categorical statements, or be such that they can be reformulated into such.
In particular statements of the form “
X are Y” are ambiguous and do not fulfil this requirement! To draw a true conclusion, the
premises must be unquestionably true. One should make sure that: :
Ambiguities can appear in the premises as well as in the conclusion; they arise, among other things, through:
Equivocation – i.e. a term is used in multiple different meanings.
Syntactic ambiguities, i.e. ambiguities in the way a statement is formed. Not to forget: ambiguities that arise from the
intensions of a term or statement. See: ☞ “masked man”. In particular, misinterpretations of the
conclusion should be avoided: :
As a matter of principle,
conclusions must be interpreted as narrowly as possible. Except from what is expressly stated, nothing else can be concluded – except by further valid inferrences. An
existential proposition in the conclusion only states that at least one example exists. It does not imply any information on prevalence. Since
universal propositions may refer to empty extension sets, having one of the in the conclusion does not automatically imply that the phenomenon described actually exists.
This list does not claim to be exhaustive – there are other fallacies, such as those of
rhetorics or mathematics, up to and including psychological effects by which false conclusions can be drawn.
About this App
This app is part of the project “Ad Hominem Info”, an attempt to systematically collect and explain errors and fallacies in thinking and reasoning.
This is a private hobby project, there are no commercial or academic interests behind it.
The information in this app and web site have been collected and validated to the best of our knowledge. Nevertheless, errors can of course never be excluded. Please understand that no guarantee can therefore be given for the accuracy of the information.
For more informationen, please see the
Homepage of the „Ad Hominem“-Wiki.
This App is part of the website:
Ad Hominem Info
Fallacies from A to
Note: this is a private hobbyist project and not a commercial website.
(Responsability for content and technical issues)
Links to external sites are checked for correctness and reliability with all due diligence. Please understand that the operator of this site cannot be held responsible for any issues related to other websites.
In particular, the operator of this site cannot be held responsible for the content, availability, correctness and accuracy of the linked pages, their offers, links or any advertisements on other sites.
Access to this website is recorded in log files, this data is used exclusively for statistical analysis. The following information is logged: name of the file/page requested, date and time of the call, amount of data transferred, success status of the request, web browser and requesting address. This log data will never be combined with any personal data.
Further personal data is only recorded if you provide this information voluntarily, for example by sending an email or registering for a newsletter.
The „Syllogism-Finder“-app does not use any cookies or other mechanisms to store data in the users’ web browsers or computers. Except for the log files, there are also no other methods used to track users or create profiles.
This app shows links to the “Ad Hominem”-wiki. The content management software used on that site (
DokuWiki) requires certain technical cookies in order to work, however, they are also not used to track users or create user profiles.
For more information, please see the
Cookies page on the wiki and the DokuWiki . FAQs