# svi (blogs) — RSS Amplifier Recent posts from the 2 feeds in the RSS Amplifier directory that cover svi. Page: Feed: --- ## [IMATE LI OVO POSUĐE U KUĆI?: Ovi stari tanjiri iz vitrine danas vrijede pravo bogatstvo!](https://www.slobodna-bosna.ba/vijest/501089/imate_li_ovo_posudje_u_kuci_ovi_stari_tanjiri_iz_vitrine_danas_vrijede_pravo_bogatstvo.html) _2026-08-20 · Jeste li znali - RSS | Slobodna-Bosna.ba_ Kolekcionari ne pitaju za cijenu ## [100.000 PUTA BRŽA OD AVIONA: Otkrivena zvijezda koja ruši sve rekorde u Mliječnom putu](https://www.slobodna-bosna.ba/vijest/501073/100_000_puta_brza_od_aviona_otkrivena_zvijezda_koja_rusi_sve_rekorde_u_mlijechnom_putu.html) _2026-08-20 · Jeste li znali - RSS | Slobodna-Bosna.ba_ Astronomi su otkrili najbržu dosad poznatu zvijezdu u Mliječnom putu. Zvijezda juri oko supermasivne crne rupe u centru naše galaksije. ## ['ČUDO NEVIĐENO' U BiH: Kako izgleda bunar star više od 2.000 godina koji nikad nije presušio (VIDEO)](https://www.slobodna-bosna.ba/vijest/501069/chudo_nevidjeno_u_bih_kako_izgleda_bunar_star_vise_od_2_000_godina_koji_nikad_nije_presusio_video.html) _2026-08-20 · Jeste li znali - RSS | Slobodna-Bosna.ba_ Posebnu vrijednost cijelom lokalitetu daje i činjenica da se u neposrednoj blizini nalazi čuvena nekropola stećaka Boljuni. ## [PREPOZNAJTE NA VRIJEME: Ova dva znaka mogu otkriti da li imate zmiju u vašoj blizini](https://www.slobodna-bosna.ba/vijest/501020/prepoznajte_na_vrijeme_ova_dva_znaka_mogu_otkriti_da_li_imate_zmiju_u_vasoj_blizini.html) _2026-08-20 · Jeste li znali - RSS | Slobodna-Bosna.ba_ Praktični savjeti ## [ZAVRŠIO JE U EGZILU, PREVAREN I IZDAN: Zla sudbina jednog od najvećih bosanskih vojskovođa svih vremena...](https://www.slobodna-bosna.ba/vijest/500966/zavrsio_je_u_egzilu_prevaren_i_izdan_zla_sudbina_jednog_od_najvecih_bosanskih_vojskovodja_svih_vremena.html) _2026-08-20 · Jeste li znali - RSS | Slobodna-Bosna.ba_ "Slobodna Bosna" nastavlja serijal iz povijesti. ## [NIJE VAŽNO SAMO KOLIKO RADITE: Velike oscilacije u radnom vremenu mogu ozbiljno utjecati na zdravlje](https://www.slobodna-bosna.ba/vijest/500946/nije_vazno_samo_koliko_radite_velike_oscilacije_u_radnom_vremenu_mogu_ozbiljno_utjecati_na_zdravlje.html) _2026-08-19 · Jeste li znali - RSS | Slobodna-Bosna.ba_ Rezultati pokazuju da su velike oscilacije u radnom vremenu povezane s većim rizikom od pogoršanja zdravlja kod muškaraca koji i dalje rade. ## [ALERGIJA MOŽE 'NAPASTI' I U ZRELOJ DOBI: Evo šta se događa u organizmu i koji faktori mogu biti okidač](https://www.slobodna-bosna.ba/vijest/500913/alergija_moze_napasti_i_u_zreloj_dobi_evo_sta_se_dogadja_u_organizmu_i_koji_faktori_mogu_biti_okidach.html) _2026-08-19 · Jeste li znali - RSS | Slobodna-Bosna.ba_ Značajnu ulogu u pojavi kasnijih alergija ima i okruženje u kojem boravimo. ## [ZABORAVITE NA PRODUŽNE KABLOVE: Ovo je novi trend u uređenju enterijera koji svi žele imati u kući](https://www.slobodna-bosna.ba/vijest/500857/zaboravite_na_produzne_kablove_ovo_je_novi_trend_u_uredjenju_enterijera_koji_svi_zele_imati_u_kuci.html) _2026-08-19 · Jeste li znali - RSS | Slobodna-Bosna.ba_ Arhitekti mijenjaju pravila, evo kako će izgledati moderni domovi ## [DA SE NAJEŽIŠ: Napuštenu kuću u Bosni svi zaobilazili u širokom luku, a onda se pojavio video...](https://www.slobodna-bosna.ba/vijest/500773/da_se_najezis_napustenu_kucu_u_bosni_svi_zaobilazili_u_sirokom_luku_a_onda_se_pojavio_video.html) _2026-08-19 · Jeste li znali - RSS | Slobodna-Bosna.ba_ "Slobodna Bosna" nastavlja serijal iz povijesti. ## [ŠOKANTNA TAJNA KULTNOG FILMA: Je li 'Valter brani Sarajevo' nastao na priči o četničkom oficiru...](https://www.slobodna-bosna.ba/vijest/500744/sokantna_tajna_kultnog_filma_je_li_valter_brani_sarajevo_nastao_na_prichi_o_chetnichkom_oficiru.html) _2026-08-18 · Jeste li znali - RSS | Slobodna-Bosna.ba_ Otkriveni njemački arhivi koji razotkrivaju kako su komunističke vlasti prekrajale historiju i stvarale filmske mitove. ## [Persona-led AI publishing (Sponsored)](https://crawlproof.com/a/FgnbKpEBwXEY) _2026-08-18 · **Sponsored**_ Generate drafts, schedule subdomain publishing, and keep human review where needed. ## [What Can Go Wrong During Caplet Stripping?](https://chasethedevil.github.io/post/what-can-go-wrong-during-caplet-stripping/) _2026-06-25 · Chase the Devil_ You may or may not have heard that a piecewise-linear interpolation of caplet vols is not stable, it leads to oscillations in the caplet stripping procedure (implying caplet volatilities from cap vol market quotes). And many revert to piecewise-constant interpolation as a consequence. Several years ago, such a case was brought upon myself and I thought at the time that maybe if we used knots… ## [Non-practical Pricing Techniques for Cliquets?](https://chasethedevil.github.io/post/bad-methods-for-cliquets/) _2026-06-24 · Chase the Devil_ I have been looking at various techniques for cliquet pricing with a focus on the Heston model. The obvious way is to use Monte-Carlo. Can we do better? The difficulty of the somewhat simple contract I was looking at is the presence of a global floor, without a local floor, but with a local cap. The payoff reads \\( max(0, min(C, \\sum\_{i=1}^n \\frac{S(t\_i)-S(t\_{i-1})}{S(t\_{i-1})})) \\)… ## [A Bachelier Normal Implied Volatility Solver](https://chasethedevil.github.io/post/a-faster-bachelier-normal-implied-volatility-solver/) _2026-06-07 · Chase the Devil_ Around 2014 , I proposed a few Bachelier implied volatility “solvers”. The first one was inspired by Steven G. Johnson’s Faddeeva package for the complex error function: it used a piecewise Chebyshev polynomial representation to have a near machine accurate representation of the Bachelier implied volatility. Why did I put “solver” in quotes? Because the problem can be… ## [The Role of Erfcx and Erfc in the Black-Scholes Formula](https://chasethedevil.github.io/post/black-formula-erfcx-erfc-backends/) _2026-05-30 · Chase the Devil_ This note compares special-function choices at the level that matters to the implied volatility solvers : the normalized Black beta price, not standalone erfcx(x) . For x = log(F/K) \<= 0 and total volatility s = sigma sqrt(T) , the beta-space OTM call price is B(x, s) = 0.5 \* (exp(x/2) \* erfc(q1) - exp(-x/2) \* erfc(q2)) q1 = -(x/s + s/2) / sqrt(2) q2 = -(x/s - s/2) /… ## [Which erfcx?](https://chasethedevil.github.io/post/erfcx-cody-commons-johnson/) _2026-05-24 · Chase the Devil_ The use of erfcx instead of direct erfc or CDF in a Black-Scholes implied volatility solver leads to gain in accuracy and performance in general. But which erfcx should we use? This note compares practical erfcx implementations for Rust implied volatility solvers: Commons: the local Rust port of Apache Commons Numbers BoostErf.erfcx Cody: the Cody rational approximation… ## [A Faster Monotone Implied Volatiltty Solver](https://chasethedevil.github.io/post/a-faster-monotone-implied-volatility-solver/) _2026-05-23 · Chase the Devil_ Choi, Huh and Su have a very good paper entitled Tighter uniform bounds for Black–Scholes implied volatility and the applications to root-finding . What’s particularly great is that it gives both a decent lower bound and a proof a monotone convergence using Newton’s method starting from this lower bound. The industry standard for solving the Black-Scholes implied volatility is… ## [Almost Explicit Implied Volatility](https://chasethedevil.github.io/post/almost-explicit-implied-volatility/) _2026-04-30 · Chase the Devil_ Several years ago, I had explored accuracy and performance of different ways to imply the Black-Scholes volatility. Jherek Healy proposed some improvements over my naive algorithm on his blog . Recently, a Linkedin post mentioned a new paper from Wolfgang Schadner which presents an almost explicit formula for the implied volatility. Almost because it actually relies on some implementation of the… ## [Owen Scrambling a la Burley](https://chasethedevil.github.io/post/burley_owen_scrambling/) _2026-01-08 · Chase the Devil_ In my last post , I had a look at Quantlib implementation of a new scrambling method for Sobol due to Brent Burley of Walt Disney Studios Practical Hash-based Owen Scrambling . Because it originates from the CG community, I had assumed that this was faster than the more classic scrambling ACM Algorithm 823 by Hickernell and Hong. I was wrong. It may be faster for specific use cases, but… ## [Jack Audio in Opensuse Tumbleweed](https://chasethedevil.github.io/post/jack_in_opensuse_tumbleweed/) _2025-12-22 · Chase the Devil_ I struggled a bit having Jack Audio Connection Kit working in Opensuse Tumbleweed. My error was to install the jack package. The solution is actually extremely simple: use pipewire-jack instead of jack. sudo zypper in pipewire-jack qjackctl ## [Owen Scrambling in Quantlib](https://chasethedevil.github.io/post/owen_scrambling_in_quantlib/) _2025-12-17 · Chase the Devil_ The state of the art of Sobol scrambling has changed slightly recently, thanks to the paper from Brent Burley of Walt Disney Studios Practical Hash-based Owen Scrambling . Before that, ACM Algorithm 823 by Hickernell and Hong was the usual reference. Brent Burley’s algorithm is supposedly both faster and with better properties. In particular, it performs both shuffling and scrambling.… ## [Hire AI-Powered Professionals (Sponsored)](https://crawlproof.com/a/KUrJ5kGrGmDU) _2025-12-17 · **Sponsored**_ Browse public gigs, message candidates, and run video interviews — free to start. ## [Deep Neural Networks and Julia](https://chasethedevil.github.io/post/deep_neural_networks_and_julia/) _2025-10-07 · Chase the Devil_ Recently, I have spent some time on simple neural networks. The idea is to employ them as universal function approximators for some problems appearing in quantitative finance. There are some great papers on it such as the one from Liu et al. (2019) or Horvath et al. (2019) Deep Learning Volatility or Rosenbaum & Zhang (2021) . Incidentally, I met Liu back when I was finishing my PhD in TU… ## [Stochastic Collocation - Old And New](https://chasethedevil.github.io/post/stochastic_collocation_old_and_new/) _2025-08-05 · Chase the Devil_ Thomas Roos recently put a preprint on SSRN called Simple, Flexible, Analytic, Arbitrage Free Volatility Interpolation . Being interested in the subject, I had a detailed look at it. It turns out that Thomas stumbled upon spline stochastic collocation without realizing it. There are a few differences in his approach: The optimization is on the x’s instead of the y’s,… ## [NUFFT and COS](https://chasethedevil.github.io/post/nufft_and_cos/) _2025-07-14 · Chase the Devil_ Leif Andersen and Mark Lake recently proposed the use of Non-Uniform Fast Fourier Transform for option pricing via the characteristic function. Fourier techniques are most commonly used for pricing vanilla options under the Heston model, in order to calibrate the model. They can be applied to other models, typically with known characteristic function, but also with numerically solved… ## [Forward Variance Models and Calibration](https://chasethedevil.github.io/post/forward-variance-models-and-calibration/) _2025-06-21 · Chase the Devil_ The modern rough volatility models adopt a forward variance curve terminology (see for example this paper on a rational approximation for the rough Heston , or this presentation on affine forward variance models or this paper on affine forward variance models ). In this form, the rough Heston model reads: According to the litterature, the initial forward variance curve is… ## [A Not So Great New Simulation Scheme for the Heston Model](https://chasethedevil.github.io/post/not-so-great-new-scheme-heston/) _2025-06-18 · Chase the Devil_ I recently saw a news about a great new simulation scheme for the Heston model by Abi Jaber . The paper suggests it is better than the popular alternatives such as the QE scheme of Leif Andersen. Reading it quickly, perhaps too quickly, I had the impression it would be more accurate especially when the number of time-steps is small. The scheme is simple to implement so I decided to spend… ## [Expansions for the time-dependent Heston model: Useless?](https://chasethedevil.github.io/post/useless-expansions-heston/) _2025-06-01 · Chase the Devil_ Fabrice Rouah wrote two books on the Heston model: one with C# and Matlab code, and one with VBA code. The two books are very similar. They are good in that they tackle most of the important points with the Heston model, from calibration to simulation. The calibration part (chapter 6) is a bit too short, it would have been great if it presented the actual difficulties with calibration in practice… ## [A New Asian Basket Spread Option Approximation](https://chasethedevil.github.io/post/new_spread_option_approximation/) _2025-04-22 · Chase the Devil_ Around 10 years ago, while reading the excellent paper of Etore and Gobet on stochastic Taylor expansions for the pricing of vanilla options with discrete (cash) dividends , I had the idea of a small improvement, by using a more precise proxy for the Taylor expansion. More recently, I applied the idea to approximate arithmetic Asian options prices by using the geometric Asian option price as… ## [LLMs Are Not Good For Basic Homework](https://chasethedevil.github.io/post/llm_not_good_at_homework/) _2025-03-06 · Chase the Devil_ My 12 years old child recently had a presentation to do with 3 other children for school, the subject was food and health. It was particularly difficult to organize the children and one of the children came with a full presentation with text, generated by an LLM (possibly corrected by the parents). At first, I thought this was just cheating and completly useless. Furthermore, he failed to… ## [Calibrating Heston to Variance Swaps - a bad idea?](https://chasethedevil.github.io/post/heston_variance_swap_calibration/) _2025-02-11 · Chase the Devil_ An interesting idea to calibrate the Heston model in a more stable manner and reduce the calibration time is to make use of variance swap prices. Indeed, there is a simple formula for the theoretical price of a variance swap in the Heston model. It is not perfect since it approximates the variance swap price by the expectation of the integrated variance process over time. In… ## [OpenSuse Tumbleweed to the Rescue](https://chasethedevil.github.io/post/opensuse_tumbleweed/) _2025-02-06 · Chase the Devil_ I recently upgraded a desktop computer, and to my surprise, the new motherboard was not fully supported by most Linux distributions. The main culprit was the network adapter, although the secure boot setup gave me lots of troubles as well. I had only a small usb key (2GB) and most (all?) live distributions do not fit on 2GB anymore. With the exception of Ubuntu images, I did not manage to… ## [Point once, get highlights (Sponsored)](https://crawlproof.com/a/BrHHWpvK9CKL) _2025-02-06 · **Sponsored**_ Get minutes worth watching from a whole game — point once ## [Saving Us - Book Review](https://chasethedevil.github.io/post/saving_us_book_review/) _2024-10-13 · Chase the Devil_ I had the opportunity to receive a free book on climate change, through the company I am working for. I had not heard of that book before, it called Saving Us and is written by an actual climate scientist (Katharine Hayhoe). Unfortunately, written by does not mean that it is a scientific book, and it’s not. The author does not spend much effort explaining the physics or the reports, but… ## [Monotonicity of the Black-Scholes Option Prices in Practice](https://chasethedevil.github.io/post/vol_monotonicity_in_practice/) _2024-09-29 · Chase the Devil_ It is well known that vanilla option prices must increase when we increase the implied volatility. Recently, a post on the Wilmott forums wondered about the true accuracy of Peter Jaeckel implied volatility solver, whether it was truely IEEE 754 compliant. In fact, the author noticed some inaccuracy in the option price itself. Unfortunately I can not reply to the forum, its login process does not…