SKU: 83508225821

Wavefronts and Rays (2nd Ed)

$95.68 $106.31
Save 10%
No.2 Bestseller on salfueradeti.es >

Pay in installments of $26.58 with ShopPay, AfterPay and Klarna

Shipping Estimate
USA
  • USA
  • CAN

Ships within 48 hours · Estimated delivery Jul 22 - Jul 27

Promo Codes Available:

For Your Every Summer RSVP, with Code: SUMMER15

Description

Wavefronts and Rays (2nd Ed)This textbook incorporated with many illuminating examples and exercises is aimed at graduate students of physical sciences and engineering. The purpose is to provide a background of physics and underlying mathematics for the concept of rays, filling the gap between mathematics and physics textbooks for a coherent treatment of all topics. The authors' emphasis and extremely good presentation of the theory of characteristics, which defines the rays,

 

This textbook -- incorporated with many illuminating examples and exercises -- is aimed at graduate students of physical sciences and engineering. The purpose is to provide a background of physics and underlying mathematics for the concept of rays, filling the gap between mathematics and physics textbooks for a coherent treatment of all topics. The authors' emphasis and extremely good presentation of the theory of characteristics, which defines the rays, accentuate the beauty and versatility of this theory. To this end, the rigour of the formulation -- by a pure mathematician's standards -- is downplayed to highlight the physical meaning and to make the subject accessible to a wider audience. The authors describe in detail the theory of characteristics for different types of differential equations, the applications to wave propagation in different types of media, and phenomena such as caustics.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 83508225821

Discover Niche Categories That Outsell

Top-Converting Item to Boost Your Average Order

4.0 ★★★★★
Based on 17 reviews
Sort
Highest Rating
Newest First
Oldest First
Product Reviews
S
Verified Purchase
Susan Cartwright
Waukegan, US
★★★★★ 5
Overall, these are some of the most comfortable flip flops I have owned, and would buy again.
Size: 6.5, Color: White Khaki
I was so happy with these KuaiLu Flip Flops that I bought two more pair, one in black and one in brown! They were comfortable right out of the box and did not need any break-in time. The arch support is excellent and gives my feet much better support than regular flip flops. They are also light weight, well made, and cute enough to wear with many different outfits. The soles have good traction, and they feel sturdy when walking.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 28, 2026
C
Verified Purchase
Carolyn Fenzl
New York, US
★★★★★ 5
Nice Flip Flops for the Price!
Size: 7.5, Color: White Khaki, Size: 7.5, Color: White Khaki
I just received my flip flops and tried them on, and they have a nice cushiony feel to them. The white color matches many of my outfits great. And while the fit is generally good, they could be a bit wider as I have wide feet. But they still feel comfortable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
N
Verified Purchase
Nellie from Wisconsin
Whiting, US
★★★★★ 4
runs big
Size: 7.5, Color: Camel
I am always a size 8 in boots, sandals, sneakers and read these ran large so ordered a size 7.5. They are still too big on me. I sent back for a 7 and I will update when I get those. They are very, very cute and comfortable! I love the cloth that goes over the foot!! That makes them seem a bit more fancy than regular flip flops. They also do sound like regular flip flops, so if you want a quiet sandal these are not for you. They are very cushioned and I can def feel the arch support. You will need to size down at least half size and maybe one whole size. The hardest thing for me was to pick a color! May have to get several pair! Just ordered my mom the dark blue and I know she will love them!!! Highly recommend, especially for the low price! Update: Got the 7 and are still too big. As I said, I got my mom the 6 so I tried them on and they are still a tad too big on me!!! BTW the sizes 8,7.5,7 and the 6 I can hardly see any difference whatsoever! They don't come in 5 1/2 so I am sending the 7 back for a 6 and keeping those just because they are so darn cute and comfortable! I also don't have a very thick foot so I wish the straps were a tad tighter, but I will deal with it. So, to sum up: Be sure to size down at least one size and maybe even two. Returns are easy, so maybe try a few different sizes! I haven't worn a size 6 since I was in about the 6th grade, so not sure what is going on with the sizing. Oh yeah, I did get three different colors and the sizing was the same with all three. HTH! Good luck!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 26, 2026
A
Verified Purchase
Amazon user
Omaha, US
★★★★★ 5
Super comfortable from the first wear! Unique soles
Size: 10, Color: White Khaki
My husband actually picked these shoes out and bought them for me without my knowledge for a vacation we were going on. When I discovered he had bought me some sandals I assumed they would likely be super uncomfortable, too narrow, weird looking etc lol. I definitely didn’t give him enough credit. I absolutely love these shoes! They are incredibly comfortable! They match pretty much everything. The bow at the toes is so cute! The soles are a very cool sturdy and hard almost wood like material, while also feeling like a dream to wear. I ended up wearing them with my bathing suits, my shorts, my sundresses and even a couple of dressy outfits! I pretty much kept them on the whole vacation and ignored the 10 other pairs I wasted time and space packing. I don’t know what it is with these shoes but even o. Days we were walking really long distances at the beach or on days I was running all over the cruise boat from dusk til dawn, I never once felt uncomfortable in these and felt just the opposite in fact. I often get achey feet too; but it didn’t happen with these. Whether I was strolling the deck, dancing in the club, or standing waiting in long buffet lines, these shoes had me feeling fancy free and footloose.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
S
Verified Purchase
Stefany Harms
Fort Morgan, US
★★★★★ 5
The best sandals EVER
Size: 8, Color: White Khaki
These flip flops are so so so comfortable. I have bunions and a nerve problems so finding the right shoe is an issue for me. These are the most comfortable flip flops I have ever had the pleasure to wear. I cannot recommend enough how good and natural these feel. They are flexible yet supportive. So far on vacation they have walked miles with me and still in great condition. They are so naturally light weight. I will be buying again for sure
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2026

recommand products

Flower
35.89
Plant Protein Bite | Hemp - Nut - Orange - Natural - Vegan, No Added Sugar, Soy Free & No Additives - Health Horizon - 25gm
40.00
MACE PERFORMANCE 6.125" H-BEAM CONRODS TO SUIT HSV SV99 VT LS1 5.7L V8
357.50
TWISTER AUDIO CARNAGE SERIES 8000W RMS @ 1 OHM (FULLY BRIDGED)(C8000.1D)
304.50
Fish Oil | Cod Liver Oil (Omega 3) – For All Stages Of Life – Supports Your Brain, Eyes, Heart & Bones – Mymatsya – 500ml
3500.00