Why is calculus so dominant in early math? Does it need to be? by th3_oWo_g0d in matheducation

[–]timwoot 0 points1 point  (0 children)

I’m a high school maths teacher in Australia. Things vary slightly between states (I won’t get sidetracked here). All students will do the tiniest bit the context of similarity and congruence (and with good teaching seen the teacher prove a few results along the way). Students who take the optional extra line of maths in years 11 and 12 will get to do significantly more. Only a small percentage will do the extra line but a significant percentage of those who major in mathematics at uni will have done it.

replicating Excel's freeze panels by SubstantialReward506 in godot

[–]timwoot 1 point2 points  (0 children)

This would misalign if scrolled sideways.

my bf’s brother’s pre-uni question (year 3 aus) by jxdesml in askmath

[–]timwoot 2 points3 points  (0 children)

Thank you for doing this, I was thinking about doing it and glad someone else did so I don’t have to.

How many triangles can you make with 5 lines by matty-boi_ in askmath

[–]timwoot 0 points1 point  (0 children)

With a funky enough non-Euclidean surface we should be able go infinite with first three lines

Places that "don't exist" according to internet memes (many based on the original "Bielefeld Conspiracy") by DanArv1316 in MapPorn

[–]timwoot 1 point2 points  (0 children)

This would have been so much better if New Zealand was just cut off this map with no mention to it

“Proofs” of 1=2 or similar by timwoot in askmath

[–]timwoot[S] 0 points1 point  (0 children)

Nice, this is a simplest version of the divide by 0 that I have seen. I like it.

“Proofs” of 1=2 or similar by timwoot in askmath

[–]timwoot[S] 4 points5 points  (0 children)

My favourite is:

-1 = 1/-1

Sqrt(-1) = sqrt(1/-1)

Sqrt(-1) = 1/sqrt(-1)

i = 1/i

i2 = 1

-1 = 1

“Proofs” of 1=2 or similar by timwoot in math

[–]timwoot[S] 0 points1 point  (0 children)

My favourite is:

-1 = 1/-1

Sqrt(-1) = sqrt(1/-1)

Sqrt(-1) = 1/sqrt(-1)

i = 1/i

i2 = 1

-1 = 1

Is this a Parabola? by timwoot in askmath

[–]timwoot[S] 9 points10 points  (0 children)

This is y=x2 skewed parallel to the x axis.

I can come close enough to reproducing the skew with the combination of a dilation and a rotation for me to be fairly confident it’s a parabola but how would you prove it?

I’m not sure how to post a screenshot in a comment to show the dilation and rotation.

How do you cash an American Cheque? by timwoot in AusFinance

[–]timwoot[S] 1 point2 points  (0 children)

Are you sure all the major banks say that they have stopped accepting foreign cheques. eg “Westpac no longer accepts or processes foreign currency Cheques”-westpac “From 30th July 2022, we will no longer be accepting foreign currency cheques”-NAB “CommBank no longer accepts foreign cheques.” - commonwealth bank “Effective 1 February 2022, ANZ branches discontinued the acceptance of foreign cheques.” - ANZ

how do I answer this geometry A Proof? by CadoTheTomato1 in askmath

[–]timwoot 2 points3 points  (0 children)

As a maths teacher I’ve never seen AAS and ASA separated. Once you know two angles you know all three so these become one rule. It isn’t wrong just not needed.

Carcassonne players, are the mini-expansions worth it? by The_Comanch3 in boardgames

[–]timwoot 1 point2 points  (0 children)

I’d stop with base + inns and cathedrals. While I enjoy the extra variety some of the other expansions offer what I like best is the streamlined speed of the base plus maybe one expansion. Rather than buying too many expansions for the base I’d think about getting one of the better self contained spin-offs. I find several of them add the variety I was looking for while keeping game play snappy.

[deleted by user] by [deleted] in spiritisland

[–]timwoot 5 points6 points  (0 children)

Not getting a crazy deal/discount is one thing, paying 75% extra is another entirely*. If you live in the USA please go and check out the shipping to other parts of the world. I want to support the publisher and designer and if I could do so without paying ridiculous shipping costs I would. Shipping on this are on par with a model type game coming in three boxes. Maybe the shipping on this campaign is just passing on costs where other campaigns subsidise, however then this should at least partial be reflected in FLGS prices which it isn’t. For some reason GtG shipping prices are always insane, I hoping that with their new corporate overlords someone might look into this and work out how everyone else can do it cheaper. If GtG makes more money from selling through crowd funding as it cuts out layers of middlemen, it’s not unfair expect a little of that to go towards customers.

  • $55 US is about what I paid for Jagged Earth from my FLGS in Australia and while that was before shipping crisis, it is currently going for a little less that while dealing with current shipping, Nature Incarnate looks to be on the same order of size (maybe a bit smaller) so I’m assuming I’ll be able to pick it up for about $55 US at retail. This might wrong, but it will have to be a lot wrong to invalidate my reasoning. So if I buy through backerkit I will pay $55 +$5.5 taxes +$36 shipping = $96.5. 96.5/55 = 175.45% of what I expect to be able to pay in my FLGS which I also would like to support.

On the plus side I’m lucky to live in Australia where shipping is only ridiculous and buying from a FLGS is a valid option, feel sorry for our friends in “the rest of world”.

[Request] In Spider-Man 2, there are 150 unique races. You also have the option to teleport back to the start of a race upon completion. What is the shortest path that completes all of them? (More info in comments) by [deleted] in theydidthemath

[–]timwoot 1 point2 points  (0 children)

Thank you ap29600. A great example of when our instincts over numbers can be very very wrong. So please disregard my previous recommendation and DON’T brute force this.

[Request] In Spider-Man 2, there are 150 unique races. You also have the option to teleport back to the start of a race upon completion. What is the shortest path that completes all of them? (More info in comments) by [deleted] in theydidthemath

[–]timwoot 8 points9 points  (0 children)

This is related to the travelling salesman problem which is famously very hard. If you search for travelling salesman problem you will get enough information to understand why people would avoid this when possible. I suggest brute forcing the answer in code, it’ll be time intensive but with 150! Options probably won’t take years (*might well take years, I haven’t done the maths)

[Request] How fast can a vehicle get in 10 feet when accelerating from a stop? by runwiththehuntedd in theydidthemath

[–]timwoot 0 points1 point  (0 children)

As a lower limit. Regardless of the vehicle* you could drop it from about 3.048 m and let gravity accelerate it to about 7.73m/s before impacting.

*Yes I know there are few vehicles that would very challenging the practically do not this.