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9 hours ago comment added Dilip Sarwate The use of $j$ to denote $\sqrt{-1}$ instead of $i$ (universal in more mathematical circles) reinforces @Mahmoud's suggestion that dsp.SE would be a better place for this question. They use $j$ over there all the time.
10 hours ago comment added Mahmoud dsp.stackexchange.com would likely be a better place for this question since digital communication theory is covered in detail there
10 hours ago history became hot network question
15 hours ago history edited Userhanu CC BY-SA 4.0
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15 hours ago history edited Userhanu CC BY-SA 4.0
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15 hours ago answer added Martin Modrák timeline score: 3
17 hours ago history edited Userhanu CC BY-SA 4.0
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18 hours ago history asked Userhanu CC BY-SA 4.0