Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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**aftermath****Member**- Registered: 2012-12-28
- Posts: 6

hi , how to prove that the union of countable set and uncountable set is uncountable ? thanks

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**scientia****Member**- Registered: 2009-11-13
- Posts: 222

Hint: Any set containing an uncountable subset is uncountable.

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**aftermath****Member**- Registered: 2012-12-28
- Posts: 6

thank you scientia

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**mathaholic****Member**- From: Juliania
- Registered: 2012-11-29
- Posts: 2,895
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Welcome to the forum, aftermath.

"What is the square root of 2? 1.4141592653589793238" Seriously, I thought it was that. Too round?

3.141592653589793238...

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**aftermath****Member**- Registered: 2012-12-28
- Posts: 6

thanks julian i think this forum can help me a lot . GODbless !

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