13.3.5: Argument Based on Signs

Logical Reasoning · LibreTexts

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    From LibreTexts, under not declared, as the source states it; its equations are written in TeX, which the PDF shows typeset. This page at LibreTexts.

    There's a railroad crossing sign ahead on the highway, so there's a railroad crossing ahead. This is simple reasoning in the form of an argument based on signs. These arguments occur without the use of the word "sign," though. Here is another example.

    Look, it just moved. It's alive! Shoot!

    The argument here is that movement is a sign of being alive, so, since it moved, it is alive. Not all signs are completely solid evidence, though. The find moves the sand, but the sand isn't alive.

    This page titled 13.3.5: Argument Based on Signs was last modified on Sat, 19 Sep 2026 16:23:50 GMT and is shared under a not declared license and was authored, remixed, and/or curated by Bradley H. Dowden.