formal logic (modus tollens) T-shirt, printed on organic cotton

$26.62

Shipping to United States: $4.16


Logic is the field of philosophy which is concerned with the validity of reasoning and the rules of inference. Here, in this argument which takes the form of a "modus tollens", one could replace "p" and "q" by any proposition. For example, if "p" meant "I wouldn't wear this T-shirt" and "q" meant "I don't like logic", we would have the following argument:
If it is true that I wouldn't wear this T-shirt, then I don't like logic.
But it's not true that I don't like logic.
Therefore, it is not true that I would not wear this T-shirt.

Convincing isn't it!?!?!

This T-shirt is printed on organic cotton (certified). The T-shirt also comes from USA factories (sweatshop free).

The gray T-shirt is only available in unisex sizes. The white one is available in both unisex and women sizes.

To have a better idea of the sizes, see the charts a little lower. The lenght is calculated from the back collar till the end of the back. The width is mesured under armpits.

unisex sizes
Lenght x width
S: 70 cm x 46 cm
M: 73 cm x 51 cm
L: 76 cm x 56 cm
XL: 78 cm x 61 cm
XXL 80 cm x 66 cm


Women sizes
Lenght x width
S: 64,7 cm x 43,8 cm
M: 66 cm x 48,9 cm
L: 68,5 cm x 54 cm
XL: 71 cm x 59 cm

Shipping from Canada

Processing time

3-5 business days

Estimated shipping times

  • Canada : 3 - 5 business days
  • North America : 5 - 10 business days
  • Europe : 10 - 14 business days

I'll do my best to meet these shipping estimates, but can't guarantee them. Actual delivery time will depend on the shipping method you choose.

Customs and import taxes

Buyers are responsible for any customs and import taxes that may apply. I'm not responsible for delays due to customs.

Payment Options

Secure options
  • Accepts Etsy gift cards

Returns & Exchanges

I gladly accept returns and exchanges

Just contact me within: 14 days of delivery

Ship items back to me within: 30 days of delivery

I don't accept cancellations

But please contact me if you have any problems with your order.

The following items can't be returned or exchanged

Because of the nature of these items, unless they arrive damaged or defective, I can't accept returns for:

  • Custom or personalized orders
  • Items on sale

Conditions of return

Buyers are responsible for return shipping costs. If the item is not returned in its original condition, the buyer is responsible for any loss in value.