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我在Ropsten上观看了Weth-dai池的状态（104356071028999999961933，4222393388012675303130025）和0.3％的费用。
因此，其做市商k = 440793144016302785315704912324574874873249338325。
然后，我向其发送了1000000000000000 weth，使池状态更改为（10435617102899999999999961933,233,4233,4253.到44078825189922742914812232388888881530978138779512。
任何人都可以让我知道为什么k不根据定义保持其价值不变？
I was watching the state of the WETH-DAI pool on Ropsten which was (10435607102899899961933, 422393388012675303130025) and its 0.3% fee.
So its market maker k = 4407931440163027853157049123245748733249338325.
Then I sent 1000000000000000 WETH to it making the pool state changed to (10435617102899899961933, 422388295347420373432664) and the k changed to 4407882518992274291481223238881530978138779512.
Can anyone let me know why the k not keeping its value unchanged by definition?
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所谓的“恒定产品”公式正在欺骗，因为由于UNISWAP的0.3％费用，K值实际上会在每笔交易上发生变化。如果不涉及费用，这只是一个恒定的产品。
该费用作为流动性存入游泳池，并在游泳池中增加流动性会改变您所看到的K值。
我发现文章在解释在不同情况下如何影响K值有用。
The so called "constant-product" formula is deceiving since the K value will actually change on each transaction because of Uniswap's 0.3% fee. It's only a constant product if there's no fee involved.
The fee is deposited as liquidity in the pool, and adding liquidity to the pool changes the K value which is what you're seeing.
I found this article to be useful in explaining how the K value is affected in different scenarios.