The word presupposes means to quite literally suppose beforehand or to imply to know beforehand. To presuppose the truth of the conclusion beforehand is to take the conclusion as true prior to the introduction of the premises or completely disregards the premises as the conclusion is already presupposed or implied to be known as true before any logical reasoning. Like the king of france is bald, you presupposed there was a king of france to begin with.
Whenever I see this, I just replace the word "presupposes" with the word "assumes." Usually works out well and makes it easier for me to understand when I'm in a time crunch. @zaq3 explains the actual meaning better.
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The word presupposes means to quite literally suppose beforehand or to imply to know beforehand. To presuppose the truth of the conclusion beforehand is to take the conclusion as true prior to the introduction of the premises or completely disregards the premises as the conclusion is already presupposed or implied to be known as true before any logical reasoning. Like the king of france is bald, you presupposed there was a king of france to begin with.
Whenever I see this, I just replace the word "presupposes" with the word "assumes." Usually works out well and makes it easier for me to understand when I'm in a time crunch. @zaq3 explains the actual meaning better.