What means "equal" in Euclid 4th postulate?
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All right angles are equal to each other
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Open axioms of equality
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what's the wrong when we use Euclid logic to prove the twin prime conjecture?
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Why must a null hypothesis contain equality?
45422
Why is Euclid's proof on the infinitude of primes considered a proof?
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How is HCF (c, d) = HCF (d, r), where c = dq +r (by Euclid's division lemma)?
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Understanding Euclid's proof that the number of primes is infinite.
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Clarifying on how if p,q is logically equivalent to p only if q
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Is it true that the order of $ab$ is always equal to the order of $ba$?
115295
Why are the two dot product definitions equal?
141227
How to show the integers have same cardinality as the natural numbers?
144050
Is there an infinite number of primes constructed as in Euclid's proof?
48797
Proving Two Sets are Equal - Infinite Sets - Example
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How do we know Euclid's sequence always generates a new prime?
48495
Is it possible to prove the independence of the parallel postulate without non-euclidean geometry?
128060
Proof that the relation $5 \mid (a + 4b)$ is symmetric and transitive
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$ac\equiv bc \pmod{\!m}\!\!\iff\!\! a\equiv b \pmod{\!\!\frac{m}{(c,m)}}$ [Euclid's Lemma, congruence form]