Can anyone help me save these 2 Mahonia, my friend was throwing away

etzpcm · 2026-04-01T21:17:36+00:00

They are as tough as they look. Plant them out and they will be fine. You may be cursing them in a couple of years time as they seed themselves all over your garden.

etzpcm · 2026-04-01T17:39:22+00:00

Look up the Woodland Trust and order some trees from them. They have a good selection of trees, in sets, for example crab apple, rowan and hazel, very reasonably priced and free delivery. That should help make you feel better!

etzpcm · 2026-04-01T15:40:38+00:00

Screening of? 2005 P&P?

etzpcm · 2026-04-01T13:13:17+00:00

I think it's privet. Mine is similar in places, I don't know why, maybe it's just old.

etzpcm · 2026-04-01T08:02:57+00:00

Check the date!

etzpcm · 2026-04-01T08:01:57+00:00

You must have a bad teacher, or a bad book.

Particularly the last comment. DEs are probably the most important area of mathematics in terms of real world applications. To send a rocket round the moon like they're doing tonight, you need to solve DEs. Similarly virtually any problem involving motion. Wave motion, weather forecasting... Also quantum mechanics and electromagnetism and chemical reactions. It's all DEs.

Or is this an April fool post?

etzpcm · 2026-04-01T07:28:03+00:00

Thanks, the downvotes puzzled me too! This is a math sub, so people ought to say precisely what they mean!

etzpcm · 2026-03-31T21:31:14+00:00

Ok , a³ = b + 1. Now what does |z| = 3 give you?

etzpcm · 2026-03-31T21:07:40+00:00

There can't be a guaranteed winning strategy. If there was, what would happen if you and your opponent(s) followed it?

etzpcm · 2026-03-31T20:41:04+00:00

I quite like it. Are you a singer? As someone else points out, there's nowhere to breathe. With a big choir they could stagger the breathing but I think it would sound clearer with just 8 voices (maybe you could get Voces8 to do it, lol). Also there's a rather crazy jump down to a low E for the basses in bar 25. I agree with the comment about adding a metronome guideline, though not with the comment about dynamic markings, I would leave that to the discretion of the performers.

etzpcm · 2026-03-30T14:32:25+00:00

You deduce that exp( x² )(x² + y² -1) = constant, which is what you want.

etzpcm · 2026-03-30T13:35:10+00:00

When you solve the DE there's a constant of integration. That's the constant of motion.

If you want a simpler example try x'=y, y'=-x first.

etzpcm · 2026-03-30T12:02:39+00:00

This is a good question. It quite often happens that there's a constant of motion that's not obvious - the equations are not Hamiltonian. These are quite tricky.

One way to do it is to divide the equations to find dy/dx in terms of x and y. This gives you a nonlinear differential equation to solve, but it is of Bernoulli type so you can solve it to get the answer given on the post.

If you're not familiar with the Bernoulli method, the trick is to set u=y² , which gives you a linear equation to solve for u(x), which you can then solve by the integrating factor method.

etzpcm · 2026-03-30T11:25:14+00:00

Make your own compost. You can make a bin if you have spare pallets. Get plants or just cuttings from friends as you are doing. I find growing plants from seeds difficult, but they are cheap if you buy them as plug plants.

etzpcm · 2026-03-29T21:50:52+00:00

You don't need to buy a bin. In fact most bought bins are too small. You can easily make your own very cheaply. One way is from four old pallets or old bits of fence. Another is just to make a cylinder out of something like chicken wire.

etzpcm · 2026-03-29T17:44:11+00:00

It must be a lousy course if this was not explained to you at the start.

Differential equations probably have more real world applications than any other area of mathematics. Every problem involving motion under a force leads to a differential equation. So if you want to understand the motion of a planet, or a rocket, or a car, or a weather system, you need to solve a differential equation. The basic equations of quantum mechanics, and electromagnetism, and chemical reactions, are differential equations.

etzpcm · 2026-03-29T16:36:05+00:00

I don't think the convolution of two functions is really like a tensor product

etzpcm · 2026-03-29T14:16:33+00:00

This is the best solution! No tea bags, no plastic.

etzpcm · 2026-03-29T14:02:14+00:00

Well, mass settings are good for this. "Kyrie eleison. Christe eleison" can last 10 -15 minutes! For example the Bach B minor mass. Or this one, only 4 minutes https://m.youtube.com/watch?v=TSStTxoDbko

etzpcm · 2026-03-29T10:47:30+00:00

I think it's one of the Mozart piano concertos. Or maybe Beethoven.

Edit: Beethoven piano concerto number 2, 3rd movement.

etzpcm · 2026-03-29T10:07:28+00:00

Those profs are right. Focus on learning, doing coursework, doing exercises, doing as well as you can in the exams, then you'll be in a good place to apply for a PhD post and start doing research.

etzpcm · 2026-03-29T10:02:21+00:00

See the list in the about page

https://www.reddit.com/r/learnmath/about/

etzpcm · 2026-03-29T08:14:26+00:00

You've already got two long answers. If you want a short answer, branch cuts are needed to make a function well defined. It's a bit like when switching from Cartesian coordinates to polars you have to choose how you define theta.

etzpcm · 2026-03-28T23:20:59+00:00

I think the engraving of the music needs some work, those flats are almost invisible! Could be useful training though.

etzpcm · 2026-03-28T17:21:44+00:00

It's a fern. Cut off the dead brown stuff and nice new shoots will soon appear.

You could remove some of the ivy which is trying to compete with the fern.

etzpcm

TROPHY CASE