BELGIUM (1951) Colonial math class*. Maximum card with First Day cancel. Scott No B493, Yvert No 843.
$10
FRANCE (1954) Globe*. Compass*. Allegory*. Trial color proof. 10th Congress on Weights & Measures - Metric System. Scott No 732, Yvert No 998.
$25
NIGER (1965) Woman studying arithmetic*. Deluxe sheet. Issue to promote better life through knowledge. Scott No 153, Yvert No 159.
$15
RUSSIA (1966) Mikhail Ostragradsky*. 4 kop entire with corner illustration. One of the leading mathematicians of Imperial Russia.
$5
HUNGARY (1975) Farkas Bolyai*. Imperforate. Scott No 2347.
$3
GERMANY (1977) Gauss number plane*. FDC with cachet and thematic cancel. Scott No 1246.
$5
EAST GERMANY (1977) Gauss*. FDC with cachet and thematic cancel. Scott No 1811.
$5
PORTUGAL (1978) Pedro Nunes*. Navigation maps*. Unaddressed FDC with cachet and thematic cancel. Scott Nos 1398-9.
$5
AUSTRIA (1982) Laxenburg Castle*. Black print. Scott No 1224, Yvert No 1549. 10th anniversary International Institute for Applied Systems Analysis.
$20
IRELAND (1983) Hamilton's quaternion equations. Maximum card with thematic cancel. Scott Nos 561-2, Yvert Nos 504-5.
$15
EAST GERMANY (1983) Euler*. Polyhedron*. FDC with cachet and thematic cancel. Scott No 2371.
$5
RUSSIA (1984) Friedrich Bessel*. 5 kop entire with corner illustration. Mathematician and astronomer who first determined the distance to another star.
$5
GERMANY (1984) Friedrich Bessel*. Graph of Bessel function*. Unaddressed FDC with cachet and thematic telescope cancel. Scott No 1422, Yvert No 1048.
$5
FRANCE (1984) Evariste Galois*. Maximum card with thematic cancel. Mathematician who worked with polynomials and abstract algebra. Scott No B564, Yvert No 2332.
$5
FRANCE (1986) Computer chip*. Protractor* and angles*. Maximum card with thematic cancel. Scott No 2023. Yvert No 2444. Centenary of technical schools.
$5
CZECHOSLOVAKIA (1987) Mathematicians & physicists*. Registered FDC with cachet and thematic cancel. Scott Nos 2663-5.
$10
FRANCE (1988) Jean Monnett*. Economist. Maximum card with thematic cancel. Scott No 2111, Yvert No 2533.
$5
FRANCE (1990) 30th Anniversary Organization for Economic Cooperation & Development. Maximum card with thematic cancel. Scott No 2241, Yvert No 2673.
$5
GREECE (1994) Thales of Miletus*. Konstantinos Karatheodoris*. Unaddressed FDC with cachet Scott No 1498.
$8
GERMANY (1980) Andreas Goldmayer*. Illustrated cancel on envelope. Astronomer, mathematician and calendar maker.
MONACO (1987) Isaac Newton*. Theory of gravitation*. Unaddressed FDC. Yvert No 1607. Scott No 1601.
TAIWAN (2004) Sayings with Numbers*. Set of 2 blocks of 10. Scott Nos 3573-4.
CONGO (1975) Ampere*. Electrical apparatus*. Trial color proof. Scott No 358, Yvert No 406.
AUSTRIA (1966) Peter Anich*. FDC with thematic cancel. Scott No 771. Cartographer and maker of mathematical instruments.
AUSTRIA (1966) Peter Anich*. Unaddressed FDC with thematic cachet. Scott No 771. Cartographer and maker of mathematical instruments.
HUNGARY (1977) Newton*. Double convex lens*. Registered FDC with cachet and thematic cancel. Scott No 2485. Full sheetlet.
EAST GERMANY (1980) Descartes*. Illustrated cancel on card; text in Esperanto.
FRANCE (1982) Descartes*. Illustrated cancel on envelope.
BELGIUM (1974) Adolphe Quetelet. Unaddressed FDC with cachet and thematic cancel. Scott No 885, Yvert No 1738. Belgian astronomer, mathematician, statistician and sociologist.
MALDIVES (1977) Newton*. Galileo*. Euclid*. Mendel*. Unaddressed FDC. Scott Nos 1268-71.
FRANCE (1981) Hand drawing geometric designs*. Faces*. Set of 2 maximum cards with thematic cancel. Scott Nos 1741-2, Yvert Nos 2141-2.
AUSTRIA (1984) Ancient clock*. FDC with thematic cancel. Johannes von Gmunden - 14th century mathematician and astronomer. Scott No 1295, Yvert No 1622.