Can all facts be proven?
IE.
Historical Facts - (Ie. Lincoln's assasination)
Mathematical Facts
Scientific Facts
What does your question have to do with 'grammar and sentence structure'?
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What does your question have to do with 'grammar and sentence structure'?
Mathematical Facts
Read this:
https://math.berkeley.edu/~hutching/teach/proofs.pdf
Scientific Facts
Read this:
https://www.forbes.com/sites/startswithabang/2017/11/22/scientific-proof-is-a-myth/#7dc47e762fb1
Historical Facts - (Ie. Lincoln's assasination)
Read this:
https://en.wikipedia.org/wiki/Historical_method Which has a link to this: