![TeX and Typography on Twitter: "How to put "def" on top of an equal sign to denote equal-by-definition. \stackrel{\text{def}}{=} https://t.co/I5uFGh2bss" / Twitter TeX and Typography on Twitter: "How to put "def" on top of an equal sign to denote equal-by-definition. \stackrel{\text{def}}{=} https://t.co/I5uFGh2bss" / Twitter](https://pbs.twimg.com/media/Ed3zsxWXoAI8K4O.png)
TeX and Typography on Twitter: "How to put "def" on top of an equal sign to denote equal-by-definition. \stackrel{\text{def}}{=} https://t.co/I5uFGh2bss" / Twitter
Q: How do you define the derivatives of the Heaviside, Sign, Absolute Value, and Delta functions? How do they relate to one another? | Ask a Mathematician / Ask a Physicist
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![File:Continous function with two equal and one too large Delta neighborhoods.svg - Wikimedia Commons File:Continous function with two equal and one too large Delta neighborhoods.svg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Continous_function_with_two_equal_and_one_too_large_Delta_neighborhoods.svg/2560px-Continous_function_with_two_equal_and_one_too_large_Delta_neighborhoods.svg.png)
File:Continous function with two equal and one too large Delta neighborhoods.svg - Wikimedia Commons
![and "Delta"2=x y^2z^3x^4y^5z^6x^7y^8z^9 Then "Delta"1"Delta"2 is equal to " Delta"2 3 b. "Delta"2 2 c. "Delta"2 4 d. none of these and "Delta"2=x y^2z^3x^4y^5z^6x^7y^8z^9 Then "Delta"1"Delta"2 is equal to " Delta"2 3 b. "Delta"2 2 c. "Delta"2 4 d. none of these](https://d10lpgp6xz60nq.cloudfront.net/web-thumb/32759_web.png)