Hacker News: gtani

New comment by gtani in "Six Math Essentials"

gtani — Tue, 24 Feb 2026 08:19:43 +0000

Stillwell's books are very good, as are Courant/Robbins What is Math and Ian Stewart's several books(one with David Tall as collaborator). My dad gifted me What is Math in grade school and i return to it every couple of years.

New comment by gtani in "Nasdaq to submit paperwork with SEC for round-the-clock trading"

gtani — Tue, 16 Dec 2025 12:42:29 +0000

Will take awhile for liquidity to build, just look at volume candles on /ES contract, really not much during Asian trading session

24 hour trading is avail on brokers like IBK, webull, hood, etrade, Schwab (short lists of tickers, but useful ones, QQQ, SPY SMH etc). If you're looking at just ARca's order book, liquidity is pretty thin overnight before 4am EST

New comment by gtani in "Workday project at Washington University hits $266M"

gtani — Sun, 14 Dec 2025 12:35:44 +0000

In context, WUSTL has a $13+ billion endowment and earned solid returns as last reported: https://endowment.wustl.edu/about/endowment/

So while this may sound like it'll be in the case studies of ERP/CRM etc failed projects, which has some very memorable writeups, the judgement of failure/success is still out (or shd we say jury is out)

New comment by gtani in "Show HN: I've built a tiny hand-held keyboard"

gtani — Sat, 11 Oct 2025 09:22:15 +0000

There's all kinds of text keyboard mappings including some like court reporter's input devices.

i don't actually know a lot about split/ergo/mech's and don't know of any non-rabbit-holey info sites but you can learn a bit about 1 and 2 handed split ergo's and ZMK/QMK firmware mappings at https://old.reddit.com/r/ErgoMechKeyboards/

ZMK's docs are pretty good https://zmk.dev/docs/keymaps

New comment by gtani in "The U.S. debt outlook is so dire it now resembles the student loan crisis"

gtani — Sat, 19 Jul 2025 18:24:32 +0000

Well, there's the deficit but also China's central bank has steadily reduced Treas holdings while BoJ ramps up, and other sovereigns incented to reduce if they think dollar continue to weaken or their country was running trade surplus w/US. (trying to figure out vol profile on $DXY in tradingview...)

But we are around or just over Bessent's pain points for /ZB and /zn so we'll see

Treas by central banks https://home.treasury.gov/data/treasury-international-capita...

New comment by gtani in "Betting against YouTube Financial Influencers beat the S&P 500 (risky though)?"

gtani — Thu, 17 Jul 2025 16:56:07 +0000

No idea about any of these channels but there are some on YT that give good global macro coverage:

- Vix, IV vs realized/historical

- option flows

- market makers gex, skews, (1st 3 probably best src of edge)

- /NQ and /ES trading volume,

- bond yld curve, credit spreads, how much prim dealers hold after long auctions, PBC holdings

- metals

- geopolitical: Europe / middle East / China/ South America

- energy

- currency

- commodity prompt spreads, contangos

New comment by gtani in "Claude Code feels like magic because it is iterative"

gtani — Thu, 19 Jun 2025 20:53:46 +0000

(IMO)The 2 sigma's are getting receptive audiences as pre-announces of layoffs at Amazon, MS and others yield the analog of a 50 VIX in the options markets, where enumerating mid/good/bad scenarios goes from difficult to impossible.

New comment by gtani in "Terpstra Keyboard"

gtani — Thu, 19 Jun 2025 19:41:51 +0000

Lots of good info in OPs article and this thread, and good band/classical tradition suggests, also.

I've been listening to a lot of 21st century string quartets, Ben Johnston (student of Partsch), Caroline Shaw, Garth Knox, Kevin Puts and trying to figure out how they notate them. Also spend time on fretless bass/guitar, pedal/lap steel doing ... stuff.

New comment by gtani in "SP80 Breaks the 100kph (sailing) Barrier"

gtani — Sat, 07 Jun 2025 16:33:29 +0000

Years ago, i visited a well funded project to generate power from (I think) similar kites, high aspect ratio front rams, I'll have to ask what happened to them.

New comment by gtani in "Tesla seeks to guard crash data from public disclosure"

gtani — Fri, 06 Jun 2025 02:37:53 +0000

we have 2 very recent Tesla 3's here (in the US, tho i'm not sure which gen HW 3 or 4 they have and I don't drive them), i'm told (judging by center console) reliably identify anything they need to but FSD isn't happy in construction zones with orange cones and will go slow.

New comment by gtani in "Ask HN: How do I learn practical electronic repair?"

gtani — Wed, 04 Jun 2025 01:12:04 +0000

as a parallel track, PC build/repair is pretty easy but underappreciated and definitely a marketable skill. This could include building peripherals, keyboards, especially, which i consioder a really valuable skill.

New comment by gtani in "The Colorado River is running low. The picture looks even worse underground."

gtani — Tue, 03 Jun 2025 05:16:22 +0000

This is a complex set of constraints, and people in Arizona, Nevada and Colorado etc have different perspectives on this. In my mind Lakes Powell/ Mead running low is somehow congruent to the /ZB Treasury futures contract (30 year) running lower, somehow there's a common economic invariant lurking in there.

The somewhat brighter bullet points: Northern California reservoirs are doing prety well, and the Bureau of Reclamatn can again kick the can by draining Flaming Gorge but i think this only works every few years:

https://graphs.water-data.com/flaminggorge/

https://cdec.water.ca.gov/resapp/RescondMain

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weekly watch, showing, surprisingly, nontrivial drought in Florida but drought did visibly abate in Nebraska: https://droughtmonitor.unl.edu/Maps/CompareTwoWeeks.aspx

New comment by gtani in "C++ to Rust Phrasebook"

gtani — Sun, 01 Jun 2025 17:57:43 +0000

been awhile sincei looked but i thought Drysdale's Effective Rust was a truly excellent book and aimed at simlar audience

https://www.lurklurk.org/effective-rust/

New comment by gtani in "Mathpad: A mathematical keypad for students and professionals"

gtani — Tue, 27 May 2025 02:46:49 +0000

Not bad, curious about price, but as noted by others in thread, the only really special thing are the keycaps, given those you could replicate functionality on any ZMK/QMK keyboard. I might try this as a layer of a glove 80 or ZSA voyager, s.t. like that

New comment by gtani in "Trading with Claude, and writing your own MCP server"

gtani — Tue, 27 May 2025 02:03:51 +0000

here's 2 oft cited papers on PFOF so people can think about this, general conclusions are there is more possibility of actions detrimental to retail traders in options markets

https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4609895

https://wifpr.wharton.upenn.edu/wp-content/uploads/2023/10/P...

New comment by gtani in "System Design of a Cellular APL Computer"

gtani — Sat, 19 Apr 2025 22:04:16 +0000

Interesting, how did you choose APL?

i worked in APL2 fulltime years ago, big asset backed bond models, big as in some of the largest workspaces the IBM support people had ever seen. Never occurred to me to pick it up again, but i have been looking for the Polivka/Pakin book i learned out of (the edition prior to their APL2 edition).

New comment by gtani in "CVE Foundation"

gtani — Sat, 19 Apr 2025 05:10:36 +0000

reddit thread w/sources seem credible but 11 months only and still dependent on single funder

https://old.reddit.com/r/netsec/comments/1k0dodx/mitre_suppo...

New comment by gtani in "The Trump Tariffs Just Got Even Worse"

gtani — Sun, 13 Apr 2025 12:31:52 +0000

guide to participating from home, watch:

- vix futures, front month has only hit 40 3x in 20 years, tho for sustained period starting late 2007 when the contracts were a lot lower volume

- /zb /zn futures contracts, BBB OAS spread on St. Louis fed website,

- credit default swaps, i can't find free public website

- some people say you can get insight from polymarket, other betting sites

- GDP now on Atlanta Fed website, note gold haircut

- other sites monitor options' large buys, skews and dex/gex (gamma exposure) on indexes, futures and single stocks but those sites are $ subscription

New comment by gtani in "Ask HN: Former devs who can't get a job, what did you end up doing for work?"

gtani — Thu, 27 Feb 2025 16:34:11 +0000

Don't give up on mainline, but branch out to small/medium bus ops. You have to go to as many meetups as you can, perfect your elevator pitch, make github and online presence look nice, etc.

One niche, there's lots of people looking for help coding stock/futures trading apps in sierra chart, ninja and multi trader, etc. These are in c++, c#/framework, python, mostly.

On the latter, work your network, seek out busines owners/managers who are in need of IT/web/database/email list type work and have people vouch for your tech cred/integrity (very important)

New comment by gtani in "Theoretical limitations of multi-layer Transformer"

gtani — Sun, 02 Feb 2025 19:44:18 +0000

ML texts often have refresher appendixes/intro chapters:

- https://www.deeplearningbook.org/

- https://www.cs.huji.ac.il/~shais/UnderstandingMachineLearnin...

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and math for physics texts by these authors shd be in any technical lib

- Mary Boas

- Arfken Webber Harris