Reviews Algebraic Topology

Crown CTs 4200A Four-Channel Power Amplifier 180 watts per channel at 8 Ohms

  • High power-density, with four channels CTs 4200..
  • Selectable constant-voltage 70V100V or low-impedance 48 ohm operation for each channel pair..
  • FIT Fault Isolation Topology circuitry isolates faults within affected channels..
  • Proven Crown ABB Multi-Mode output topology..
  • Continuously-variable fans optimize cooling efficiency..
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DROP + HIFIMAN HE-R7DX Over-Ear & Closed-Back Headphones with Detachable Cables, 50mm Dynamic Drivers, High Sensitivity, Easy to Drive Pro Studio Monitors, Midnight-Blue

  • A GAME-CHANGING CLOSED-BACK COMPETITOR: Outfitted with large 50-millimeter dynamic drivers and HIFIMAN’s innovative Topology Diaphragms, the HE-R7DX delivers excellent isolation, impressive details, and open-back-level soundstaging..
  • TUNED FOR TRANSPARENCY: Tuned for transparency, it’s a workhorse tailor-made for home and pro studios, as well as higher-noise environments such as communal living areas and commutes. Large 50-millimeter drivers are tuned for midrange focus, high-end clarity, and low-end punch..
  • UNCOMPROMISING COMFORT: It features hand-stitched protein leather headband, and Focus-A hybrid earpads to provide uncompromising comfort—no matter where you choose to listen..
  • EXTREMELY VERSATILE: A pair of high-efficiency, closed-back headphones that don’t need a fancy amp to sound amazing. Listen to them directly from your phone, laptop, or desktop computer..
  • TOPOLOGY DIAPHRAGM TECHNOLOGY: The Topology Diaphragm features an innovative, uniquely-manipulatable nanoparticle coating on its surface. The coating allows precise tailoring of sound wave formation allowing for a level of sonic control never before seen in headphone drivers..
  • Included components: manufacturer’s 1-year warranty.
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LifeChamp 15” Wooden Chess Set for Adults and Kids - Algebraic Notation, Handcrafted Wood Pieces, 2 Additional Queens, Portable Foldable Board Game

  • Algebraic Notation For Learning: Go from casual chess player to future Grandmaster-in-training when you start learning what every organization in the world uses to describe chess play: algebraic notation! It’s perfect for teaching youngsters the more serious aspects of chess, plus it makes a fantastic tournament chess board, too!.
  • Includes 2 Extra Queens: When you manage to sneak past your opponent and promote your pawn to an all-powerful queen, the experience can feel a little lackluster. After all, how are you supposed to “remember” that pawn is really a queen when it still looks like a pawn? With one extra queen for black and one for white, promoting pawns is easy and seamless!.
  • Secure Chess Piece Storage: Never lose another rook, knight or bishop with a unique storage design that keeps all your chess pieces right where they belong. With built-in elastic straps, each piece fits snugly against the board -- even after traveling and heavy movement. The best part? You’ll never hear another loose chess piece rattling around inside!.
  • Foldable For Easy Storage: Friends and family only have so many games in them before they’re tired of all the checkmating. When it’s time to call it a night, fold the chess board in half for quick, compact sto....
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Victor V34 Engineering/Scientific Calculator

  • Innovative two-line scrolling display shows multiple inputs and results simultaneously for ease of use..
  • Algebraic logic allows equations to be entered as they appear on printed page..
  • Trigonometric functions in degrees and radians..
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Sharp EL-531XBGR Engineering/Scientific Calculator

  • Direct Algebraic Logic to Simplify Entry of Equations.
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HP 10bII Financial Calculator

  • Intuitive keyboard layout with easy-to-read labels.
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HP 50g Graphing Calculator

  • New display upgrade--the new HP 50g display features a 30% increase in usable space over the HP 49g+.
  • New powerful SD card slot allows you to format your card right in the calculator and expand memory.
  • Massive 2.5 MB total memory--512 KB RAM plus 2 MB flash ROM for performing future upgrades**.
  • New larger equation library and 2300+ built-in functions--ideal for both professionals and students.
  • The choice of efficient RPN, Textbook or Algebraic data entry.
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Hifonics TPS-A500.2 THOR Series Class-D 2-Channel 2-Ohm Stable Powersports Amplifier For Polaris RZR/ATV/UTV/Cart/Boat

  • Hifonics TPS-A500.2 500W Peak THOR Series Class-D 2-Channel 2-Ohm Stable Powersports Amplifier.
  • MARINE GRADE PROTECTION: Amplifiers are ABYC and ASTM certified which defines that marine amplifiers must use conformal coated PC boards to resist....
  • PRE-AMP CIRCUITRY: Low Noise Pre-Amplifier Stage Special preamplifier reduces incoming noise from source units dramatically improving sound quality.
  • CLASS / TOPOLOGY: Full Range Class D Highly efficient circuit topology which helps the amplifer develop a lot of power in a very small heatsink..
  • DIAGNOSTICS: Three-stage protection circuits Monitor thermal, overload, DC, and speaker short protection with lighted indicators on the amplifier end....
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HP 50g Graphing Calculator (Renewed)

  • New display upgrade--the new HP 50g display features a 30% increase in usable space over the HP 49g+.
  • New powerful SD card slot allows you to format your card right in the calculator and expand memory.
  • Massive 2.5 MB total memory--512 KB RAM plus 2 MB flash ROM for performing future upgrades**.
  • New larger equation library and 2300+ built-in functions--ideal for both professionals and students.
  • The choice of efficient RPN, Textbook or Algebraic data entry.
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Astrobrights-25910-01 Filler Paper 8 x 10-1/2 Inches 20 lb Assorted Colors 100 Sheets

  • Astrobrights Filler Paper measuring 8" x 10-1/2" comes with wide ruling and 4-color assortment. 20 lb Paper is fun and memorable, sold as 100 per....
  • A clever short-story, an algebraic equation or a dynamic speaker's notes are just too exciting for boring white paper.
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