Achmed Durangi
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 Oct 29 comment If $\sin \theta = \frac{3}{5}$, what are the possible values of $\cos\theta$? Thanks for following up on the line of thought of the question. Oct 29 accepted If $\sin \theta = \frac{3}{5}$, what are the possible values of $\cos\theta$? Oct 29 comment If $\sin \theta = \frac{3}{5}$, what are the possible values of $\cos\theta$? The square in the conclusion was a typing error. Thanks for the edit which corrected it. Oct 29 asked If $\sin \theta = \frac{3}{5}$, what are the possible values of $\cos\theta$? Jun 2 comment Math Symbols for “Must be Finite” Interesting so although N's cardinality is countably infinite because there is no finite number to accurately describe it, we use n ∈ N to describe a finite number. Jun 2 comment Math Symbols for “Must be Finite” @Mark Bennet n ∈ N, because it is countable infinte? Jun 2 comment Math Symbols for “Must be Finite” Great Answers, thanks to all! Jun 2 revised Math Symbols for “Must be Finite” deleted 15 characters in body Jun 2 comment Math Symbols for “Must be Finite” Yes maybe.. But at least "must be finite" should be expressable in math shortags if I may call them so, no? Jun 2 asked Math Symbols for “Must be Finite” Apr 16 awarded Commentator Apr 16 accepted Is a subset an element of a set? Apr 16 comment Is a subset an element of a set? That's how I see it too. Thanks for verifiying. Apr 16 revised Is a subset an element of a set? added 9 characters in body Apr 16 comment Is a subset an element of a set? Why the downvotes? What did I say wrong. In fact this is a trivial question, but yet it is something I saw as a legit question in an actual exam, baffled by its simplicity, I wanted to make sure that I am not the only one. So don't shoot the messenger. Apr 16 asked Is a subset an element of a set? Apr 16 accepted Countably infinite subsets of natural and real numbers Apr 16 revised Countably infinite subsets of natural and real numbers Implemented suggestions from answers below. Apr 16 comment Countably infinite subsets of natural and real numbers Thanks for your answers. @MattAllegro why don't you post a reply where you elaborate on the bijective image idea. I would give you the answer then. Apr 16 asked Countably infinite subsets of natural and real numbers