• May include: A black short-sleeved t-shirt featuring the mathematical equation e^iπ + 1 = 0 in cream-colored text. Below the equation are the individual constants labeled with dots, the text FIVE CONSTANTS. ONE LINE. NO NOTES., and PROOFANDPARTICLE.COM.
  • May include: A black crewneck sweatshirt featuring the mathematical equation e^iπ + 1 = 0 in white print. Below the equation, the individual components e, i, π, 1, and 0 are labeled, followed by the text FIVE CONSTANTS. ONE LINE. NO NOTES. and PROOFANDPARTICLE.COM.
  • May include: A black t-shirt featuring the mathematical equation e^iπ + 1 = 0 in white text, worn by a person sitting at a wooden table with an open textbook, a coffee mug, and a notebook. The text "Some questions are worth staying up for." is visible.
  • May include: A navy blue short-sleeve t-shirt featuring the mathematical equation e to the power of i times pi plus one equals zero in white text. Below the equation are five dots and the text FIVE CONSTANTS. ONE LINE. NO NOTES. PROOFANDPARTICLE.COM.
  • May include: A black V-neck t-shirt featuring the white mathematical Euler's identity equation e^iπ + 1 = 0. Below the equation are the letters e, i, π, 1, 0 and the text FIVE CONSTANTS. ONE LINE. NO NOTES. with PROOFANDPARTICLE.COM at the bottom.
  • May include: A navy blue V-neck t-shirt featuring the mathematical equation e to the power of i pi plus 1 equals 0 in cream text. Below the equation are the letters e, i, pi, 1, 0 and the text FIVE CONSTANTS. ONE LINE. NO NOTES. PROOFANDPARTICLE.COM.
  • May include: A dark navy poster featuring Euler's identity equation e to the power of i times pi plus one equals zero in cream-colored text. Below the equation, the individual constants e, i, pi, 1, and 0 are listed with dots above each character.
  • May include: A rectangular print on a light beige background featuring the text Proof & Particle, Behind the Design, Five constants. One line. It explains Euler's identity with the constants e, i, pi, 1, and 0, ending with Original Edition - Front Print.
  • May include: A sizing chart for a Bella + Canvas 3001 crew neck t-shirt. The chart lists sizes S through 2XL with corresponding width and length measurements in inches, ranging from 18 to 26 inches in width and 28 to 32 inches in length.
  • May include: A sizing chart for a Bella + Canvas 3005 unisex V-neck t-shirt. The chart lists sizes S through 2XL with corresponding widths and lengths in inches, ranging from 18 to 26 inches in width and 27.75 to 31.75 inches in length.
  • May include: A beige informational graphic titled Proof & Particle Fabric & Care. It lists 100% combed and ring-spun cotton for black and navy colors, a weight of 4.2 oz/yd2, and care instructions including washing cold and air or tumble drying.
  • May include: A black short-sleeved t-shirt featuring the mathematical equation e^iπ + 1 = 0 in cream-colored text. Below the equation are the individual constants labeled with dots, the text FIVE CONSTANTS. ONE LINE. NO NOTES., and PROOFANDPARTICLE.COM.
  • May include: A black crewneck sweatshirt featuring the mathematical equation e^iπ + 1 = 0 in white print. Below the equation, the individual components e, i, π, 1, and 0 are labeled, followed by the text FIVE CONSTANTS. ONE LINE. NO NOTES. and PROOFANDPARTICLE.COM.
  • May include: A black t-shirt featuring the mathematical equation e^iπ + 1 = 0 in white text, worn by a person sitting at a wooden table with an open textbook, a coffee mug, and a notebook. The text "Some questions are worth staying up for." is visible.
  • May include: A navy blue short-sleeve t-shirt featuring the mathematical equation e to the power of i times pi plus one equals zero in white text. Below the equation are five dots and the text FIVE CONSTANTS. ONE LINE. NO NOTES. PROOFANDPARTICLE.COM.
  • May include: A black V-neck t-shirt featuring the white mathematical Euler's identity equation e^iπ + 1 = 0. Below the equation are the letters e, i, π, 1, 0 and the text FIVE CONSTANTS. ONE LINE. NO NOTES. with PROOFANDPARTICLE.COM at the bottom.
  • May include: A navy blue V-neck t-shirt featuring the mathematical equation e to the power of i pi plus 1 equals 0 in cream text. Below the equation are the letters e, i, pi, 1, 0 and the text FIVE CONSTANTS. ONE LINE. NO NOTES. PROOFANDPARTICLE.COM.
  • May include: A dark navy poster featuring Euler's identity equation e to the power of i times pi plus one equals zero in cream-colored text. Below the equation, the individual constants e, i, pi, 1, and 0 are listed with dots above each character.
  • May include: A rectangular print on a light beige background featuring the text Proof & Particle, Behind the Design, Five constants. One line. It explains Euler's identity with the constants e, i, pi, 1, and 0, ending with Original Edition - Front Print.
  • May include: A sizing chart for a Bella + Canvas 3001 crew neck t-shirt. The chart lists sizes S through 2XL with corresponding width and length measurements in inches, ranging from 18 to 26 inches in width and 28 to 32 inches in length.
  • May include: A sizing chart for a Bella + Canvas 3005 unisex V-neck t-shirt. The chart lists sizes S through 2XL with corresponding widths and lengths in inches, ranging from 18 to 26 inches in width and 27.75 to 31.75 inches in length.
  • May include: A beige informational graphic titled Proof & Particle Fabric & Care. It lists 100% combed and ring-spun cotton for black and navy colors, a weight of 4.2 oz/yd2, and care instructions including washing cold and air or tumble drying.
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Euler’s Identity T-Shirt — Five Constants Math Design

Item highlights

  • Materials: Cotton
  • Made to order

Seller's description

Euler’s identity, printed on the front of a unisex cotton T-shirt. Choose Black or Navy, crew neck or V-neck, in sizes S–2XL. Made to order. Check the size chart for your selected neckline before ordering.

Five constants. One line. No notes.

THE SHIRT
• Original Edition: artwork printed on the front
• Unisex Bella + Canvas cotton T-shirt
• Soft, lightweight fabric: 4.2 oz/yd² (142 g/m²)
• Black or Navy; crew neck or V-neck
• Sizes S, M, L, XL and 2XL
• Printed to order using direct-to-garment (DTG) printing

FIT AND SIZING
Use the crew-neck or V-neck size chart in the listing photos for your selected style. Compare the measurements with a shirt you already own and like the fit of. Pre-shrunk does not mean shrink-proof; washing and drying with heat can cause additional shrinkage.

BEHIND THE DESIGN
Euler’s identity, e^(iπ) + 1 = 0, is a small statement with an astonishing reach. It brings e, the base of natural logarithms, and π, the circle constant, together with the imaginary unit i and the numbers 1 and 0. Growth, rotation and geometry meet in a single exact relationship.

We chose it for that sense of discovery: ideas that seem to live in different worlds suddenly fit together. That thought shaped the shirt. The equation leads, and the five constants sit individually beneath it, giving each a moment of recognition. “Five constants. One line. No notes.” is our quiet nod to how much an uncluttered line can hold.

PRINTING AND FULFILLMENT
Proof & Particle creates and verifies the original artwork. Printful, our production partner, prints, packages and ships each shirt after it is ordered. Slight variations can occur because ink interacts with natural fabric fibers. See Etsy’s delivery estimate for your destination.

CARE
Follow the garment label. Wash cold, inside out, on a gentle cycle with mild detergent and similar colors. Avoid bleach and fabric softener. Air dry or tumble dry low. Do not iron directly over the print or dry clean. Warm or hot washing and high dryer heat can cause additional shrinkage and affect the print.
Full fabric and care guide: proofandparticle.com/care

DESIGN TRANSPARENCY
Generative tools supported early concept exploration, garment mockups and the staged lifestyle image. Every final word, equation, symbol and technical diagram in our artwork is independently prepared and checked by Proof & Particle. The lifestyle scene is illustrative; refer to the product views and size charts for garment details.

NEED HELP?
If an item arrives damaged, misprinted or incorrect, contact us through Etsy with photographs so we can make it right.

TRADEMARK NOTICE
PROOF & PARTICLE™ is a trademark of R Mavrovich & Associates Inc.

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Shop review

Why this review appears

All reviews are from verified buyers. This review is shown automatically based on factors like recency, whether it includes comments, your chosen language, and whether the rating reflects the typical experience with the shop.

“I’m genuinely surprised how high the quality of this T-Shirt is! I love the galaxy background radiation diagram, and the message speaks for itself. Fits well! Definitely recommend ✅”

Adam

Sep 9, 2026

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Price:$36.00

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Shipping & return policies
  • Get it by
    Oct 21-26
  • Returns & exchanges
    Accepted within 30 days
  • Cost to ship
    $4.99 to United States, 43215.

Seller's description

Specifications

May include: A black short-sleeved t-shirt featuring the mathematical equation e^iπ + 1 = 0 in cream-colored text. Below the equation are the individual constants labeled with dots, the text FIVE CONSTANTS. ONE LINE. NO NOTES., and PROOFANDPARTICLE.COM.

Euler’s identity, printed on the front of a unisex cotton T-shirt. Choose Black or Navy, crew neck or V-neck, in sizes S–2XL. Made to order. Check the size chart for your selected neckline before ordering.

Five constants. One line. No notes.

THE SHIRT
• Original Edition: artwork printed on the front
• Unisex Bella + Canvas cotton T-shirt
• Soft, lightweight fabric: 4.2 oz/yd² (142 g/m²)
• Black or Navy; crew neck or V-neck
• Sizes S, M, L, XL and 2XL
• Printed to order using direct-to-garment (DTG) printing

FIT AND SIZING
Use the crew-neck or V-neck size chart in the listing photos for your selected style. Compare the measurements with a shirt you already own and like the fit of. Pre-shrunk does not mean shrink-proof; washing and drying with heat can cause additional shrinkage.

BEHIND THE DESIGN
Euler’s identity, e^(iπ) + 1 = 0, is a small statement with an astonishing reach. It brings e, the base of natural logarithms, and π, the circle constant, together with the imaginary unit i and the numbers 1 and 0. Growth, rotation and geometry meet in a single exact relationship.

We chose it for that sense of discovery: ideas that seem to live in different worlds suddenly fit together. That thought shaped the shirt. The equation leads, and the five constants sit individually beneath it, giving each a moment of recognition. “Five constants. One line. No notes.” is our quiet nod to how much an uncluttered line can hold.

PRINTING AND FULFILLMENT
Proof & Particle creates and verifies the original artwork. Printful, our production partner, prints, packages and ships each shirt after it is ordered. Slight variations can occur because ink interacts with natural fabric fibers. See Etsy’s delivery estimate for your destination.

CARE
Follow the garment label. Wash cold, inside out, on a gentle cycle with mild detergent and similar colors. Avoid bleach and fabric softener. Air dry or tumble dry low. Do not iron directly over the print or dry clean. Warm or hot washing and high dryer heat can cause additional shrinkage and affect the print.
Full fabric and care guide: proofandparticle.com/care

DESIGN TRANSPARENCY
Generative tools supported early concept exploration, garment mockups and the staged lifestyle image. Every final word, equation, symbol and technical diagram in our artwork is independently prepared and checked by Proof & Particle. The lifestyle scene is illustrative; refer to the product views and size charts for garment details.

NEED HELP?
If an item arrives damaged, misprinted or incorrect, contact us through Etsy with photographs so we can make it right.

TRADEMARK NOTICE
PROOF & PARTICLE™ is a trademark of R Mavrovich & Associates Inc.

ProofAndParticleCo made this item with help from
Printful, Charlotte, NC

Delivery details and policies

  • Get it by
    Oct 21-26
  • Returns and exchanges
    Accepted within 30 days
  • Ships from
    Charlotte, NC
  • Cost to ship
    $4.99 to United States, 43215

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Meet your seller

Rick Mavrovich
ProofAndParticleCo ·

United States

We calculate this number using a recency-weighted average of all ratings, with a rating's value decreasing by half each year to best reflect the current experience. 5.0
·
3 sales
·
1 month on Etsy
View shop registration details

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Listed on Aug 31, 2026
Homepage Clothing