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
CZECHOSLOVAKIA (1987) Mathematicians & physicists*. Registered FDC with cachet and thematic cancel. Scott Nos 2663-5.
$10
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.
SWITZERLAND (1961) Book of Eternity*. Hourglass*. Infinity symbol*. Maximum card with thematic cancel. Scott No B303.
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.
BELGIUM (1974) Adolphe Quetelet. Maximum card with thematic cancel. Scott No 885, Yvert No 1738. Belgian astronomer, mathematician, statistician and sociologist.
MALI (1977) Newton*. Apple*. Rocket*. Unaddressed FDC. 250th anniversary of Newton's death. Scott No C301, Yvert No PA292.
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.