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Popular Question

Question with 1,000 views. This badge can be awarded multiple times.

Hanul Jeon

27.7k9 gold badges47 silver badges119 bronze badges

earned this badge 8 times.

There is a second-order sentence that is valid in standard semantics but not valid in Henkin semantics?

Awarded Feb 7 at 7:46

How to prove the Milner-Rado Paradox?

Awarded Jun 18, 2023 at 11:56

"Direct sums of injective modules over Noetherian ring is injective" and its analogue

Awarded Nov 28, 2022 at 15:49

If polynomial with rational number is injective on rationals then it is injective on reals?

Awarded Nov 2, 2022 at 15:47

Is every compact subset of $\Bbb{R}$ the support of some Borel measure?

Awarded Aug 9, 2020 at 23:11

Homogeneous second-order differential equation with constant Wronskian

Awarded Nov 13, 2019 at 11:10

Can we prove the existence of $A\cup B$ without the union axiom?

Awarded Feb 5, 2018 at 0:58

Integration of $\sqrt{x+\sqrt{x^2+3x}}$ [closed]

Awarded May 28, 2017 at 17:14

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