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truncate, ceiling, floor, and...?

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#arithmetic
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Why does $n = \sum_{k=0}^\infty \frac{1}{2^k\;e^{k-2}} \implies n = \frac{2\;e^3}{2\;e-1}$?

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#sequences-and-series #arithmetic
85
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Quick multiplication

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#arithmetic
79
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Proving that: $-\frac{2 \;i\log(i^2)}{2} = \pi$

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#complex-numbers #arithmetic
53
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Does $x^2>x^3+1 \implies x < -{1\over P}$?

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#inequality #arithmetic #irrational-numbers
2.2k
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Converting decimal ratio to a percentage

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#arithmetic #rational-numbers #decimal-expansion
5.3k
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Why is $\frac{1}{\frac{1}{X}}=X$?

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#arithmetic #intuition #inverse #fractions
408
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Criterion for sum/difference of unit fractions to be in lowest terms

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#elementary-number-theory #arithmetic
36
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Conversion of price in different seconds to determine the speed of the fall

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#linear-algebra #arithmetic
83
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Solutions for $p$ where $2 p^2 - 1 = q^2$

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#prime-numbers #arithmetic
372
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How many collections of four numbers, from 1 to 25, have a sum multiple of 5?

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#combinatorics #arithmetic
201
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If $10^{20} +20^{10}$ is divided by 4 then what would be its remainder?

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#arithmetic
1.6k
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Algebraic manipulation with square roots

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#algebra-precalculus #arithmetic
2.7k
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Split by percentage

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#algorithms #arithmetic
1.5k
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$\sqrt{x + \sqrt{2x -1}} + \sqrt{x- \sqrt{2x-1}} = A $

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#algebra-precalculus #arithmetic

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