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Ask Mathematics

Solving a delay-differential equation related to epidemiology

For some inexplicable reason, I have recently been interested in epidemiology. One of the classical and simplistic models in epidemiology is the SIR model given by the following system of first-order autonomous nonlinear ordinary differential equations in the real variables $s,i,r$ satisfying $s,i,r\geq 0$ and $s+i+r=1$: $$ \begin{align} s’ &= -\beta i s\\ i’ &= […]

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Ask English Speaking

meaning of graceful writing

In one of my posts (meaning of "stiff") a contributor explains “stiff” as “Lacking grace” and “charm”. Actually, he cited that explanation from a dictionary. Obviously, grace is the opposite, at least, in writing style. And then, what does graceful writing mean? Cambridge Dictionary gives this definition about “grace” a quality of moving in a […]

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Ask Games RPG Games

What is the origin of the goliath race in the Forgotten Realms?

I’ve always assumed that the goliath race are half-giants or pygmy giants or something like that. Something related to giants. In the descriptions of the goliath race in 5e (in Volo’s Guide to Monsters and Elemental Evil Player’s Companion), it doesn’t actually mention the race’s origins, nor does it mention their relation to giants at […]

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Mastering Development

Spring boot application.properties with Oracle NoSql

I’ve been looking for information about create an spring boot application with connection to a Oracle NoSql Database, but i only have found info about mongoDB projects…. how can i set up my application.properties to catch the driver, url, database… etc of Oracle NoSql? I mean, for MongoDB i could find this: spring.data.mongodb.authentication-database= # Authentication […]

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Ask Mathematics

Set of partial derivatives form basis for the vector space of derivations

Let $A$ be the ring of all germs of $C^\infty$ functions $f: U\rightarrow \mathbb{R}$, where $U\subset \Omega\subset \mathbb{R}^n$ are open sets. We can define a derivation on $A$ to be an $\mathbb{R}$-linear map $A\rightarrow \mathbb{R}$ that respects Leibniz rule. Then it’s obvious that the set of all derivations on $A$ forms a vector space $D$. […]

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Ask Mathematics

Knowing one $0$ of a quadratic trin., can I determine some necessary ( or sufficient) condition regarding the second root, in terms of the first one?

Suppose I am given this equation : $x^2 – 12x – 28$ = 0. Using the rational root theorem, I find that the possible rational roots are ( if I am correct): $$1/1, 2/1,7/1,14/,28/1$$ or their additive inverses. I try the number $(-2)$ and I observe it works. At this stage, knowing one solution of […]

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Ask Games RPG Games

What demons are related to the demon lords Juiblex and Zuggtmoy?

Juiblex and Zuggtmoy are demon lords, and the 5e material I have access to include the Monster Manual, Mordenkainen’s Tome of Foes, and Out of the Abyss. The Monster Manual doesn’t have much to say about these two demon lords (at least not with regards to which demons might follow them), but from Mordenkainen’s Tome […]

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Development Linux

Continuously read self overwritten outputs and parsing the lines

Sometimes a program outputs content that is self overwritten by default. For example, the output of dd if=(something) of=(something) status=progress has the following output model: 56670413312 bytes (57 GB, 53 GiB) copied, 1938 s, 29.2 MB/s and the values keep changing without printing new lines (thus, a self overwritten output). I’ve replicated this behavior with […]

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Development

Find an object properties by searching for keys by a string, and if one is true, return as true

I want to go through an Object and search for a key with a string. I want the ablity to look to see if there more then one key with the string. So if I have a string “started_on” then I want to search property named “started_on” and another one name “started_on&format”, I want to […]

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Bitcoin Cryptocurrency Development

I need your help

Sorry if I waste your time, but the reality is that mine is running and too fast. I will be brief, I am not a scammer or anything like that, I have a beautiful family, with a wife and two children, the last months we are going through a critical moment both emotionally and economically, […]